My favorite is BAB..otherwise known as Blood Alcohol Betting ---
A patient comes in usually by medics after consuming some large quantity of alcohol and attempting some mundane feat like leaning out a truck door to vomit and falling on their face..
Before the patient arrives everyone gets the story and for $ 0.25 you can place a bet.. once the patient arrives the betting stops. Everyone gets involved in this from admitting, to hospitalists, to housekeeping, but this week I am on a roll.... I have my next week worth of lattes covered!!