Our cats at work box. They both squeeze into the seat of an office chair and bat at each other with (declawed) front paws until somebody gives in. They started to do this in my lap one day but I had to send them both packing.
(Their names are Willie and Waylon). Waylon likes to jump from the counter to one of the office chairs so that the chair rolls across the room--I know most cats don't like to "ride" things but he does (he also likes to be spun on a swivel chair).
If they want to get through a doorway, all they have to do is meow and every technician in the building comes running to open the door (boy, do they have us trained).
My old cat slept with me every single night, under the covers if it was cold, on my hip (I sleep on my side) if it was hot; I often woke up with no feeling below the waist because I'd had a cat cutting off my circulation all night. If I didn't let her in my room, she would rattle the door and howl until I did, all night long if she had to.