Stlex 
[Fesshole voice] Whenever I visit someone's house, I make a point of going to the loo right after they do to exert my dominance.
unlofl [Promoted Toot]@infernusgoatus All wrong, you bolt into the bathroom right ahead of them, so they have to wait for you. Then you assert dominance by farting audibly, stopping to pick your teeth or comb your hair in front of the mirror, and trying out and comparing any toothbrushes you might come across.
@infernusgoatus Also, stuff the hand towel in the sink and leave it running right in front of them. Its not like it was going to overflow anyway, they were right there!
If you suspect they will not invite you back, get even preemptively with an upper-decker.