Blikkoppen

If you don't want to get your clothes wet I suggest taking them off before the game starts.

Man taketh a blik. Man koppeth the blik.

Okay no for real now, gather some players and stand in a circle. Grab a metal drink can that is pressurized or carbonated, and hit it to your forehead as hard as said forehead allows for 3 times. 
After hitting the can to your head, you may hand over the can to the next player in the circle. If the can is spraying drink when it is handed over to you, drink from it for 3 seconds before hitting it to your head 3 times.
If the can loses pressure while it is in your possesion, you should finish the drink after the game.

You can improve this game by adding multiple cans into the circle of people that are blikkopping.
Bonus points if you sever the blik in half.