beverometer
1)You place your cocktail on a coaster and, due to barometrical conditions measured by this activity, the glass sticks to the coaster....but invariably falls off as the above mentioned beverage is halfway to your mouth.
It was a hot and sultry night as Chad, forever the suave and debonaire bon homme, raised his glass to toast his admirers but the beverometer ruined his moment by dropping the coaster squarely onto his nutsack.