THIS year's Super Bowl set a record for the largest ever American television audience, with 106.5m football fans tuning in to see the New Orleans Saints triumph over the Indianapolis Colts.
Is the Super Bowl the most popular sports event in the world?
There are many emotional reasons people tip, such as to avoid embarrassment or to feel better about themselves because they know a tip is expected. Employees who provide services may also use tricks of the trade to manipulate these emotions to receive a larger gratuity. Have a look at the history of tipping above made by Jonathan Rivers for billshrink.com