eupbain – n. the phenomenon in which the roommate you share a bathroom with always seems to go into the bathroom right when you want to go in or use it.
Ex. My roommate and I seem to have a eupbain. Even though I go to work at 6 AM on Sunday and need to take a shower at 5 AM, my roommate goes into the shower right at 5 AM. Why am I stuck with the only other fucking person in the world that needs to gets up so early on Sundays???