I'm doing this alcohol survey thing for college, and I just happened to think of this.
(Alcohol is the most disgusting thing I have ever tasted in my life. Don't drink.)
What if, instead of having just a bowl, it was an armored box with separate storage bins for each set of keys, where a key was placed in a slot, a unique code was entered, and the only way to get the key back was to enter the same code, then pass a short game using a touchscreen (touch the randomly-spawning circles) to prevent any drunks from accessing their keys?