Form groups of 6-12 people
Have players create events and write them down on small sheets of paper. Be sure that they don't share these ideas aloud with anyone
Creativity is a MUST for this game :)
Here are some examples of events:

Being attacked by a shark while you're fishing
Hitting a home run that wins the World Series
Winning the lottery
Going on a first date

After everyone is done writing, collect all of the papers and put them in a hat.
Whithin each group, choose 3-4 people to act for each round.
Players will randomly draw from the hat
Players will be given 30 seconds to 1 minute to act out a reaction to the event that they drew
Players can use "Charades" rules, but they may also make noises and talk to the other actors (without giving the scenario away) 
After time is up, the other team members can guess at which event each person had.
You may keep score if you'd like, or just enjoy the entertainment!