The transfer route between Liverpool and West Ham United is a path particularly well-trodden, with numerous players having featured for both clubs down the years.
19 players have switched directly between Anfield and east London and a further 10 have donned the colours of both sides during their careers.
There have been stalwarts, fleeting dalliances and almost everything in between.
So, ahead of Saturday's Premier League meeting on Merseyside, we've picked out 10 of the best players to feature for both the Reds and the Hammers...
1. Javier Mascherano
West Ham: 7 games, 0 goals. LFC: 139 games, 2 goals
A title winner in Argentina and Brazil, Javier Mascherano made his debut in English football with West Ham United in 2006 before Rafael Benitez moved to sign him for the Reds - initially on loan - the following year.
It was an astute capture. Mascherano went on to establish himself as one of the world's best defensive midfielders during three-and-a-half years at Anfield and was named Argentina captain by Diego Maradona during his time on Merseyside.
His dynamic style made him a firm favourite with the Kop before he left for Barcelona in the summer of 2010.
2. Neil Ruddock
LFC: 152 games, 12 goals. West Ham: 56 games, 3 goals
Graeme Souness signed Neil Ruddock from Tottenham in 1993 to add a bit of steel to the Reds' backline. An uncompromising centre-back, 'Razor' had an incredible will to win, could hit some fantastic passes upfield and was great in the air.
He famously riled Manchester United's Eric Cantona by repeatedly turning down the Frenchman's collar and further endeared himself to Kopites when he scored a courageous late header to earn a 3-3 draw against the Red Devils in 1994.
He won the League Cup with the Reds in 1995 and left to join West Ham United as Gerard Houllier arrived in 1998.
3. Glen Johnson
West Ham: 16 games, 0 goals. LFC: 200 games, 9 goals
Full-back Glen Johnson came through West Ham's youth ranks but following the Hammers' relegation in 2003 he was snapped up by Chelsea as the first purchase of the Roman Abramovich era.
He signed for Liverpool from Portsmouth in 2009 and marked his home league debut with a goal and an assist in a man-of-the-match performance against Stoke.
The England international’s forward forays remained a trademark of his six seasons at Anfield.
4. Titi Camara
LFC: 37 games, 10 goals. West Ham: 14 games, 0 goal
Guinea striker Titi Camara - who captained and later managed his national team - arrived at Liverpool from Marseille in January 1999 and left 18 months later as a cult hero.
He scored on his debut against Sheffield Wednesday and netted some spectacular goals for the Reds, but his most memorable strike came against West Ham in October 1999.
Having been informed before kick-off that his dad had passed away, Camara told manager Gerard Houllier he wanted 'to play the match for my father'. He scored the winner and then dropped to his knees as he was overcome with emotion.
He joined Harry Redknapp's Hammers in December 2000.
5. Yossi Benayoun
West Ham: 78 games, 8 goals. LFC: 134 games, 39 goals
Israel midfielder Yossi Benayoun made his initial foray into English football with newly-promoted West Ham in 2005 and helped the Hammers reach the FA Cup final - where they lost on penalties to Liverpool.
Signed by Rafa Benitez in 2007, Benayoun featured in 47 of a possible 59 matches in his first season at Anfield. However, in 21 of those games he came off the bench and it became apparent that the Reds boss saw him as an impact player rather than and out and out starter.
But he still managed to score some crucial goals, including a winner in the Bernabeu against Real Madrid, and he was the first player to score hat-tricks in the Premier League, Champions League and FA Cup.
6. Rob Jones
LFC: 243 games, 0 goals. West Ham: 2 games, 0 goals
Signed by Graeme Souness in 1991, Rob Jones was undoubtedly Liverpool's most exciting full-back for years, but his Anfield career was sadly cut short by injuries.
However, the England international still managed to land the 1992 FA Cup and 1995 League Cup during a 243-game stint with the Reds.
He joined Redknapp's West Ham in 1999 but broke down after one and a half games, ending his career at just 27 years of age.
7. Alvaro Arbeloa
LFC: 98 games, 2 goals. West Ham: 4 games, 0 goal
Signed by Rafael Benitez from Deportivo La Coruna in January 2007, dependable Spanish full-back Alvaro Arbeloa proved to be an excellent acquisition for Liverpool.
The fan favourite spent two-and-a-half years with the Reds, playing in the 2007 Champions League final and then, after returning from Euro 2008 with a winners' medal, helping Benitez's side finish second in the Premier League as first-choice right-back during the 2008-09 season.
Arbeloa re-joined boyhood club Real Madrid in the summer of 2009 but seven years later, aged 33, he returned to the Premier League with West Ham.
8. Julian Dicks
West Ham: 326 games, 65 goals. LFC: 28 games, 3 goals
A legend at West Ham United, uncompromising left-back Julian Dicks played more than 300 games for the Hammers and also served as first-team coach under Slaven Bilic.
He left Upton Park to join Graeme Souness' Liverpool in September 1993 and spent one season at Anfield, during which time he became the last Reds player to score in front of the old standing Kop.
Dicks found himself out-of-favour under Souness' successor Roy Evans and returned to the Hammers in 1994.
9. David Burrows
LFC: 193 games, 3 goals. West Ham: 29 games, 1 goal
No-nonsense defender David Burrows arrived at Anfield from West Brom in October 1988 and the young left-back enjoyed tremendous success under managers Kenny Dalglish and Graeme Souness.
He won a league title (1990) and the FA Cup (1992) before joining West Ham (1993) as part of a deal that saw the aforementioned Dicks swap Upton Park for Anfield.
Burrows spent one season in east London before moving back to Merseyside... with Everton.
10. Ray Houghton
West Ham: 1 games, 0 goals. LFC: 202 games, 38 goals
Glasgow-born midfielder Ray Houghton came through the youth ranks at West Ham but made just one substitute appearance for the senior team before moving on.
He was signed by Liverpool from Oxford, in 1987, as the last player in the Kenny Dalglish jigsaw - joining new signings John Aldridge, Peter Beardsley and John Barnes in the side that walked away with the title in 1987-88.
The Republic of Ireland international added a league and cup double and an FA Cup before departing Anfield for Aston Villa in 1992.