VIDEO GETS GRAFFITI STAR ARRESTED: When are kids going to learn that other people can see what they post online? A teenager who smashed car windows and spray-painted walls was busted by Philadelphia police after he left a damning piece of evidence behind.

No, not his fingerprints — a YouTube video!

The clip, which clearly showed the face of the 16-year-old, also showed a group of kids spray painting the letters W and L, shorthand for the local gang Wreck Locals.

To further make things easier for the cops, the kid posted the video under the title “Wreck Locals [F Stuff] Up.” Police say they expect to have the rest of the crew in custody soon.