Key Bottle Opener
Whenever any man stands up from a seated position, his first instinct is to perform a sort of signum crucis to check for his wallet, keys, and phone. He can generally do anything with those supplies; except open a frosty bottled beverage that does not have a twist-off cap. He can open a bottle with a belt, a lighter, a table top; but nothing beats that Boy Scouty sensation of always being prepared.
Now he can impress his friends whilst drinking al fresco by opening bottles with his key. Compact, subtle and incredibly useful...the perfect stock filler!!!