Never done the milk thing, but I did throw a cake I had just made away once... paper towel in one hand, cake in the other and the wrong one went in the trash. DOH.
The only thing I could think of that I've accidentally ever taken was a pack of licorice that was under a pack of bottled water. It was raining way too hard to take them back. But I did see a Lambda Chi I knew bust his ass falling in the parking lot in the rain, at the grocery store at the same time. It was actually very, very funny.
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“All his life he tried to be a good person. Many times, however, he failed.
For after all, he was only human. He wasn't a dog.”
― Charles M. Schultz
Warning: The above post may be dripping in sarcasm and full of smartassedness.