Haha, maybe it's just the fact he's wearing a collar. My cats hate collars too, and even leads and stuff. We put a lead on the cats and they just walk for a bit, then roll over on the floor lol.
Lol cats are weird man...my cat does it when he's not sleeping in anyone's room at night, he gets lonely and meows and romps around the house, his name's George but I called him heaps of other names lol.