You were on a road trip with Kirk, Franklin, Nancy, and Sally on the way to a house franklin's dad used to own.

A little ways into the trip your friend pulls over and picks up a random hitchhiker, who seemed... off

He got in, sat next to you and seemed a little out of it, like.. insane, and not all mentally there

franklin made the mistake of fiddling with a pocket knife, when he took it from him, stared at it, giggles erratically and makes a cut on his hand, almost casually, while giggling

Franklin looked like he was about to fall out of his wheelchair, kirk looked revolted, and sally and Nancy looked as if they might pass out