There are a lot of silly laws on the books. Take this one, for example from the Municipal Code of the City of Manhattan Beach, California:
12.08.300 – Throwing missiles.
No person shall throw, or otherwise propel, any missile, or mud or sand anywhere on the beach.
First of all, what kind of missiles are contemplated here? Second, mud is a missile? Third, sand is a missile? And finally, you’re seriously criminalizing throwing sand on the beach? Bet lots of citations have been written for that one. Here’s the source. (You’ll have to scroll down to 12.08.300.)