20. No Ball Playing
Good effort, dude! Not quite what the sign had in mind, but you've certainly got balls!
19. No Smoking
Even celebrities rebel against signage! Go Psy!
18. Private Property: No Trespassing
If you're going to trespass, do it with style. The glasses, fake nose and moustache ensure that's the case here. Textbook stuff.
17. No Pets Allowed... All Pets Must Be On Leash
Here, we have one sign completely ignoring another sign. Brilliant!