All sorts of critters, usually rats, have made a lot of people lose their lunch. When Alma Rubio of San Antonio, Texas, found a three-legged frog (she probably already ate the other leg) inside a bag of salad, she took photos and marched on down to the Target store where she purchased it. The store rep apologized profusely and gave her a refund. They also confiscated the bag and frog -- you know, for evidence.
Alma is lucky she didn't find this in her bagged salad.