I love shots like the next guy but if it requires me to wear a helmet, I must stand down. Apparently there's a bar in Russia that serves a cocktail that literally requires you to wear a helmet because you get slammed in the head with your shot before you drink it then get bashed over the head with various items including a bat, fire extinguisher, shovel and a keg to top it off.
Now that, my friend, gives new meaning to the word "hangover."