Yes, we had a problem with a yogurt thief.
We have a small refrigerator in the employee lounge. Some employees put small things like yogurt in there rather than walking to the big fridge in the lunchroom. And containers of yogurt started disappearing, even if employees wrote their names on them.
Employees put increasingly nasty notes to the thief on the fridge door, but the crime continued.
Finally, one woman hid behind the sofa in the lounge midway between lunch break and afternoon break. Sure enough, the yogurt thief made her move. When the woman jumped up and yelled "put that yogurt back," the thief ran into the ladies room. The other employee promptly cornered her in a stall--and there were witnesses--and made her confess!
The peer pressure worked and the thief stopped.