Basicaly, chip in for a revolting mix of spirits, pour into 1 glass.

10 Beer mats, rest (1 at a time) over a half clenched fist, your thumb being at the top. Using your pinky, poke a hole in the middle, without any rips to the sides etc. The last 2 people to finish take 2 big gulps outta the pint glass. Then they are both givin another 5 mats. Last one to finish necks the remaining concoction.

Edit -

To be done with a group of mates.