I've never had that dream or ever heard of anyone that has. It does remind me of Pogo though. That dog can pee longer than any canine or human I have ever seen. I thought it was just me until the neighbor mentioned it the other day. I may have to video it. It's actually funny it's so ridiculous.
I've had that Mr.X. (appart from thinking I pissed the bed). More common, very common I dream I'm trying to find the bathroom, its either full or I can't go for some reason. Finally I wake up needing to go take a leak.