Just Another Night...

I'm working night shift at the local gas station, and let me tell you... it gets so boring! Last week, I was like, 'Why not?' And suddenly, I started leaving little notes for customers on their windshields. You know... just silly things like, 'Drive safe' or 'Have a good day.' Yeah, yeah, I guess technically that's vandalism, but come on, nobody cares, right? People always smile and laugh when they find them. So here's my question: am I crazy for thinking this is harmless fun... or is it just normal to pass the time with something light-hearted? What do you guys think...?