Me and my college roommate had a pet squirrel. Little baby that fell out of the tree, my roommate patched him up, raised him so to speak and before too long we had a house squirrel...the thing was actually trained to use the bathroom outside or in a particular corner of it's giant cage that he slept it.
It was a pretty cool pet, it would go outside with you, run to the top of a tree, get bored and come back down and sit on your shoulder until you went back inside the house. In the end though it was taken away...we fed it nuts and things like that but discovered after a year or so that it loved hamburgers...anyway, that was horrible for him and he got sick. Took him to the Vet and they took him away because apparently it's against the law to have a pet squirrel. Pretty gay but that's America.