Well ID, this is about as close I as I get to it.....
Many years ago first son was about 18 months old and wife pregant with second one. He would wake up in the night and cry for bottle of water. I had this down pat, wife nudges me awake, I shuffle to kitchen get bottle of water from fridge then go upstairs and give him the bottle. Then down the stairs and back into bed, falling asleep in about 5 seconds after head is on pillow. no big deal.
Then one fateful night I got the urge to tinkle when getting back to our bedroom. There was a small space under the stairs that was converted to a walk-in/back-out bathroom with only a toilet. Not wanting to turn on a light and wake up my wife, I backed into the space and was in the process of sitting down to relieve myself when my wife who was already sitting there poked me in the right cheek of my buttocks and said very loudly, "Don't sit on me!". I ran screaming in fear into the dining room and the very quickly upstairs to other bathroom as relief was desperately required now................
Whew!