This is my interpretation of an encounter from the Critical Role episode "Cornered" (C2E53).
There won't be any spoilers in my post so those of you who watch and are not caught up, don't worry.
When you walk into this tavern it is impossible not to notice the large gravel pit that takes up almost half of the space. You can see the dark stains throughout, some look fresher than others, and it doesn't take long for the first fight to begin. Anyone who thinks they are tough and are looking to make a few bucks can throw their wager in the center of the pit and take a seat in one of the four chairs. Patrons can match the wager to claim a chair for themselves, up to four contestants at a time. Once everyone is seated, the fight begins.
Video of my process here!