Basically, name a dare, then the next person will name for how much money (in US$, for convenience) would they do the dare for. If you really don't mind it, say "FREE!". If you would never do it for no matter how much money, say "NEVER!". After that, name another dare
Example:
Person 1: Drink a cup of water from a toilet
Person 2: $750,000. Eat 200 liquorice flavoured jellybeans
Person 3: FREE! Kill your dad
Person 4: NEVER!
So it goes on
First dare:
Eat 20 live worms