Thought for the day?

I was being lazy and leaning out of a window to take a photo of a nice bit of grim at the back of my building and as I stood back, I noticed this small message written on the painted wall of the corridor.

It's in a spot where students often hang about whilst chatting on their mobile phones (despite repeated "shushing" from us and signs asking them not to) so I presume that's how it appeared.

Anyway, it intrigued me so instead of a bit of architectural grim, you get this. Nice to see it's properly punctuated with a full stop at the end ;-)