Booze Thieves - they could be those sneaky neighbor kids or those co-workers you don't really like, but felt obligated to invite them to the party. If you've got a bottle you want to keep everyone else out of, consider getting one of these:

It's a bottle stopper with a combination lock! You're not getting into the bottle unless you dial in the code... OR smash the bottle on the floor out of frustration.

There are multiple models on the market like: THIS or THAT