My 3M are trained to pee when I give them the "go pee" command. A while ago, I wanted to ask my hubby if he wanted to use the bathroom before I was taking a shower by saying in a stern voice, "honey, go pee"
He immediately bent down to go on all fours to the bathroom.

It was the most hilarious thing I've ever seen my hubby doing

By the way when I said so, Missy also peed right there and then on the living room - my fault, obviously, so we had a good laugh about it, instead of taking her outside to the right spot. The poor baby looked so confused!