Free to Pee, You and Me

Every parent has one of these stories, whether it's his/her own or that of a friend. Tuesday, while Jamie was in our bedroom changing his clothes after school, Duncan stripped himself naked and peed on the couch. If that parent is (un)lucky, he/she has another. This morning, before Duncan even made it to breakfast, he stripped off his diaper and pajamas and peed on his bath. It has been 48 hours straight of laundry. If only we knew the motivation of a 2 1/2 year old...this could be a good thing, right? An awareness that one has to pee and difficulty navigating all the variables to make a trip to the potty happen? Or it could be naughty...but he doesn't seem to find it funny. Any advice? I don't want to risk traumatizing the kid and setting back his toilet training, so we're left with reminders that there are two places to pee (in your diaper or in the toilet) and requiring him to participate a little in the cleaning up so that he realizes there are some consequences. The boy is home from school so I have to run because anything could happen, and we don't yet have one of those stories about poop...