In Brussels, there's a small bronze statue called Manneken Pee, which translates to "Little Man Pee." Aw. If you haven't guessed, it's of a tiny peeing boy, and yes it's also a fountain. The statue was originally designed by Hiëronymus Duquesnoy the Elder, and put in place in the early 1600s. Though that was a long time ago, I bet it was funny for the same reasons then as it is now.
There is also a version of Manneken Pis in Tokyo as well, in the Hamamatsuchō Station. That Manneken Pis has its own local flavor; specifically, the locals like to dress sit up in little costumes for it to Pis out of.