I had a roommate who drank in the shower, which led to the most interesting roommate discussions I have ever had.

"I know you like to drink in the shower, and I'm cool with whatever makes you happy, but could you remove the empty beer bottles from the shower? I go in there to get clean and I feel disgusting showering with empty beer bottles."

"Sure, no problem."

-about a week later:

"Ok, I promise to change it so it doesn't get nasty but I need the trophy beer bottle in the shower."

"Ok, whatever. As long as you change it."