The drink guard
We applaud this Welsh-inventor's altruistic intent when designing the Drink-Guard, a device to prevent date rapists from slipping drugs into unsuspecting female bar patrons' drinks. Place the plastic cap on your beer bottle, remove the key, and leave the bottle at will for extended bathroom breaks or to feed the jukebox. After returning check the cap and a red light will signal if anyone's attempted to tamper with it. If you're in the clear, just unlock and continue towards inebriation. The only problem, this only works with the standard beer bottle, which is gonna be a problem since we know how the ladies love those girly mixed drinks.
