Why can't orphans play football?
Because they can't be on the home team.
Orphan Football Team
Explanation
Explain Bear
Listen up, smarty pants! The joke is that orphans don't have a "home" in the traditional sense, so they can't be on the "home team." Get it? It's, like, a double meaning. Maybe if you spent less time picking your nose and more time reading, you'd understand.