A leader is nominated. Throughout the night each person keeps chewing on thiere gum. Each time the designated leader yells out "blow" all the people playing have to first yell out "blow" and then blow a bubble with their gum or bubblegum. The last to do so buys the leader a drink and that person then becomes the leader. Note - Yes it might be hard to casualy drink whilst chewing gum all night I know BUT it can be done, and for an added variant you could have a rule saying any person who removes there gum buys a round of drinks.