Why can an orphan play baseball?
They don't know where home is.
Listen up, buttercup. This "joke" is a play on words. Orphans don't have a "home" in the traditional sense, see? And in baseball, "home" is also a base. So, the joke is that orphans can play baseball because they literally don't know where the home base is. I bet you also think that participation trophies are cool, don't you?