For those that don't know, in almost all levels of the game of basketball each player gets five fouls per game. When the fifth foul is called you "foul out" and have to sit out the remainder of the game. In all my years of organized basketball I only fouled out of one game, and I did it with two fouls.
(Granted, it's easy to get fewer than five fouls when you don't actually get in the game, but that's beside the point.)
When my incredibly handsome twin brother Ron and I attended Texas Tech in the late 80's they had one of the largest intramural sports programs in the nation. (Because what else are you going to do in Lubbock?) They had male, female and co-ed teams in Greek, dorm and open divisions. Fellow college students were scorekeepers, timers and referees, and not so surprisinly mistakes were sometimes made.
Our freshman year we played on several of our dorm floor's teams, including the basketball team. During one game I was playing defense on an opposing player, and I was whistled for my second foul of the game. After the referee gave the nature of the offense to the scorekeeper he then informed me that I had fouled out of the game.
Naturally, I protested by noting it was only my second foul, and he said they had five fouls for me. I said, "You do realize I have a twin brother also playing, and I'm betting you put his three fouls on me." However, my argument fell on deaf ears, and I had to sit out the rest of the game.
You can bet in every game after that one of us wore a bandanna or some other differentiator.
EPILOGUE: Looking back, as long as both of us weren't in the game at the same time I probably could have gone back in the game, and they never would have known the difference.