Stormy, our resident genius bunny, has been part of many collaborative mutual training efforts. Most recently, we've reached an agreement that she'll go to the top of the bunny house (not pictured) for petting, so that kwc won't have to bend over all the time and damage his already-fatigued discs.
Of course, as part of trying to convince her to do this, we want to reward her when she does go to the top of the house, so we feel obliged to come over and pet her when she does so. Stormy was quick to capitalize on this to ensure more petting. Where before she would look and hope you'd notice, now she goes to the top of the house and stares at you until you come over.
As with many things involving human behavior, she gets it. Smart, smart rabbit.