Mystery 'guest' sign in

A stand out in the school of dumb criminals, Peter Addison of the UK takes center stage. After smashing plates and cups throughout a children's center and then hosing the entire mess with fire extinguishers genius Peter signed an erasible board 'Peter Addison was here'. Crime doesn't seem to pay, nor suit, in this case. I'm trying to think which is worse, causing the damage in the first place or being so stupid that you want to brag about what an absolute jerk you are.