The thing about pranks is that there's always someone who takes it too far, thus ruining the joke for everyone. I mean, sure, it's funny to call up the most dead-eyed cast member of The Hills, and tell her you want her to star in your House On Sorority Row remake, which starts shooting tomorrow so don't be late. And, yes, it's also funny to do the same thing to Bruce Willis and Demi Moore's daughter. Of course that's a good prank. And it's all stifled laughter, and swallowed gaffaws for the first day as you watch the girls struggle to act and take the whole "being a movie star" thing seriouslly. But really there's a point where you have to drop the charade, and tell them it's a prank. Otherwise, you're actually making a House On Sorority Row remake, and no one wants that, do they?