VIDEOS:
CB '21 [Bathroom Fight]
Cowboy Bebop 2021 - Ep 02 [Venus Pop]: While waiting for one of their bounties at a church (which is having a wedding). Spike heads to the restroom, just as he's finishing up. One of the guest comes in. He seems normal enough, until Spike notices the blade in his arm soon revealing himself to be an assassin sent by Vicious. This leads into a life or death fight in the stalls.
Example of:
Bathroom Brawl