Christmas
A time when an obese, chubby, and hairy man with a body mass index of 'obesity category III' (before cookies) uses the illegal tactic of breaking and entering to raid your home, steal your cookies, and then leave presents that you will most likely be anticipating for the whole night.

Is literally invisible when you try to catch him in the act. Nothing will work. (Or course, unless, you use thermonuclear bombs.)
"How was your Christmas?"
"A bald obese guy broke into my home and stole my cookies."
"That's nice. What did you get?"
"Coal."