Dumbest security guard

He was working in the security industry as I do and everyone knew that this guy was not the brightest right? When he was younger a guy in the area used to take him round houses and warehouses to clean them out! He'd give the kid a mars bar for every place they did! Telling him that he was helping the people move! Ummm...no you fool he was robbing the place.
Anyway, years when by and this guy worked as a security guard, he bumped into that guy he "worked" for all those years ago and struck up a conversation. The guy was keen to learn what places he was guarding. One night, he heard a sound went out to investigate and found a mars bar on the ground. He picked it up and took it back into the sight he was guarding and eat it and that was all the remembered for the next 6 hours and he woke up and the place was robbed...and he had been too.