Some of these signs are inherently funny, others are improved by funny animals. Either way, how can you go wrong? (Pro-tip: you can't!)
Source: deviantart.com / via: kyo-wolf.deviantart.com
I hope they're not speaking from experience.
It was Stripper Day at the aquarium.
Source: farm3.staticflickr.com / via: travinder
How do they know?