Not exactly shoplifting, but a way to get 2 for 1.

I went to Walmart and bought 2 big ass bags of dog food for $30 each.

I went back the next day and said I only bought 1 but was charged for 2. The return person had a manager come over, they didn't bat an eye, they just refunded it right away. No questions asked.

Theoretically, I could go back another time and return one of the bags, essentially just getting one for free.

If you have balls and some free time, it might be worth trying this on something worth more than $30.