Bunny jail.

Simon:  Remember when you ran past the little human and went into the utility room?

River:  Yeah!  There's all sorts of neat and dangerous stuff in there.  Good times!

Simon:  And remember when you got escorted out of there, then decided to sneak back in not 5 minutes later?

River:  Of course, there was exploring to do!

Simon:  Yeah, that's why you're in time-out.