Mystery Diners S05E11 - Coupon Coup

The owner of The Hangout in California notices a large increase in the number of coupons used. The Mystery Diners point to the manager who isn't doing his job and leaves work to go surfing in the middle of his shift and one of the waitresses who is selling coupons to her co-workers from a blank roll of register tape. During the confrontation, the manager and waitress are both fired.