Jerry Seinfeld, onstage trying out new comedy bits at LA's famed Improv, asked for a waiter to bring him a drink. Moments later, Ellen DeGeneres sashayed onstage with a towel over her arm and Jerry's drink on a cocktail tray! Jerry, who was NOT in on the gag, looked stunned when Ellen refused to leave the stage until he paid for the drink! He finally fished out a $10 bill and asked for change. I don't have any, purred Ellen -- and the crowd roared as she pocketed the bill and split!