People can be so greedy.
One day I was demoing the fancy chicken sausages that come 4 to a pack and I actually had to tell a guy he couldn't have any more samples after he ate at least two whole sausages by himself.
Dumbass complained to my manager; luckily he complained to the good manager and got a review of sample policy.
Another time I left Almondina cookies out after finishing my shift, put about 8 packages in the sample dome with tongs. Apparently they disappeared fast because an hour after I left, one of my coworkers found a guy standing there munching his way through a whole package by himself. He'd just opened them and decided to eat them all since they were free samples.
My personal favorite was a guy who tried to argue that I should just give him a larger sample since he was going to take several samples anyway. He actually tried to snatch a bagel pizza off my chopping board one day while I was cutting up the other one from the package.
Idiot almost lost his fingers.