Whenever Tristan, whose three, has to go potty, he'll just hold it. And hold it. And hold it. Until eventually he has one hand in front, one hand in back and is hopping around like a kangaroo. By this time, we've asked him ten times if he needs to go and he'll just say no. So, finally a little while after the kangaroo hopping starts, he'll eventually just give up and go to the potty. I'm not sure why hopping helps, but it sure is funny!