When you’re driving down the road, armadillos don’t see you coming and they’re not very fast. When they realize you’re right over them, you’ve straddled them with your wheels, they don’t freeze, they leap. That doesn’t usually end well for the armadillo.
Henry, sleeping in the hallway, doesn’t hear us coming. At the exact moment we’re stepping over him, it’s absolutely certain that he’s going to suddenly realize we’re there and leap, knocking himself out on the oil pan.