Too many to list but for futbol Landon Donovan, Brad Friedel, David Beckham, Michael Owen for my worst world cup in 2002 haha.
Chris Waddle! I remember as a kid writing an ongoing story about a new football club who had all fictional players but with Chris Waddle making a star appearance in the team just because I thought he was ace. Funnily enough the players were signed for the club through a process of submitting CVs. No trials or previous professional clubs required. Bizarre but then Graeme Souness used the same method.
Another vote for Duncan Sharp. Made Vinnie Jones look like Walter the Softy. Oh and Spotty the Dog from the Woodentops.
My first ever live game was a friendly when Liverpool played at Scunthorpe in 1981 - it was Ray Clemence's last ever game for Liverpool, and their team that day also included Hansen, Dalgleish, and Rush as a substitute - I can't remember any of that, but the lineup was available online (https://www.lfchistory.net/SeasonArchive/FriendlyGame/8124)