Gllen likes to do this thing that I call "The Creepy Hand". Don't get grossed out. Its hard to describe this without sounding pervy. But that's the best name I could come up with...
Usually he employs this tactic while I'm driving and he is the passenger. I'll be paying attention to the road, and all of a sudden, from the corner of my eye, I'll notice his hand stealthily moving towards my knee. He does it so slowly that I don't notice it until its right over my knee and then, as soon as I espy it, he'll strike like a viper and grab my knee.
It's rather unsettling. He manages to do this every time I'm trying to accomplish a difficult road maneuver, like merging across three lanes of traffic, or avoiding a deathly pot-hole.
I hate it. I always scream at him that he's going to get us killed.
He won't stop doing it.