No Stopping
...Except for this rat. This is a sillier piece of art on a simple street sign. Street art is really about using what's available and getting creative, and whoever tagged this did exactly that!
RIP SpongeBob
It looks like someone (maybe someone who paints the yellow lines on roads) accidentally spilled some paint. Another someone (probably a street artist) added a little SpongeBob accent to make it seem like he got a little squished.