Q: Why can't orphans be on a football team?
A: Because they won't know where to go on a home game.
Q: Why can't orphans be on a football team?
A: Because they won't know where to go on a home game.
This is a play on words. Usually, a 'home game' is played at the team's home stadium, but 'home' also refers to having a home/family. Orphans don't have a home in the latter sense, so they wouldn't know where to go for a 'home' game.