What are some good work games to raise money for after work drinks?

So the idea has to be a game in which people that drink on fridays after work can play to raise money for drinks after work.



Ideally it would raise about $100 per week to go toward buying a couple of slabs and can be either a fine or a game in which participating costs you to play but the winner only takes a portion of the winnings etc.



Help me out!What are some good work games to raise money for after work drinks?
We have a swear jar at work and a game of the week e.g. If you use the boss's name you have to put a dollar in the jar.



We also have a social club where everyone puts $5 in a fortnight and that gets spent on drinks whether that person comes or not.



We also have a chocolate box and a drinks fridge where people can buy them for $1.



We also have a lottery with 6 numbers. If you get 5 numbers you get a free game next week, 6 numbers you win the jackpot which has added up each week.