(shower-stealing, as defined by my house: getting in while the other person is standing in the bathroom waiting for the water to get warm - yes, I know it is wasteful to run the water while not using the shower.)
Stealing a shower while someone is actually showering!
P got in the shower that I was already in and just stood right in front of the water and cleaned up and left, while I waited
freakin' wet and cold patiently for him to finish.
And, to add insult to injury - he didn't even try any funny business with the loofah if you know what I mean!