When you go to pee, but your colon decides it's time to take the Brownies for a swim. Happens too often to be a coincidence.
"I can't believe it Marge. Everytime I sit down to pee, my butthole thinks it's time to poop! I must have have Pavlov's Butthole!"
The conditioning of pooping work so consistently, you have to poop when you get there, whether you've eaten or not.
Every time I clock in, Pavlov's Butthole kicks in.