The coolest thing about graffiti is that there's no right or wrong way to go about it. For starters, Ninja Turtle and dirt versions exist. And while most of the art is super cool, our favorite is definitely the clever and hilarious kind.

Why keep things serious when they can be stupid and entertaining? Our silly graffiti finds do just this-- they remind us to watch out for ninjas and go all "Hammertime" at a stop sign. Check out more of 'em below!

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