50 Calibre Shot Glass
Novely shot glasses don't come much more awesome than this one. It's shaped like a bullet shell, which a) brings a whole new meaning to the term 'shot glass', and b) makes you look about a million times cooler when you're getting its contents down your neck. You can put any sort of alcohol in the bullet; no matter what kind of spirit or liqueur you're sipping, you're bound to feel like the baddest ass in the whole damn bar. If James Bond did shots instead of martinis, this is the glass he'd use.
Convinced already? Slow down, soldier, we haven't even mentioned the accessories yet! The 50 Calibre Shot Glass comes in an attractive, elegant gift tube (perhaps it would make a good engagement gift for the stag himself?) and you even get a little stand shaped like a bullet chamber. Down your shot, and place the bullet glass in the stand when you're done to keep it safe!