I second that whipping their head around April. We've had boa's grab the fridge door as we went by, sweep stuff off tables, almost smack their fool heads into things. You have to be really aware as you move around with one of these beauties....they are very quick when they decide to investigate something.
Oh yeah, both Julinar and Diva have smacked their heads into walls before while having a 'gotta grab someting' spaz-attack. Their heads kind of make a splat sound when they hit stuff.. kinda disconcerting.