I once ended up behind someone like ebay woman in a toysRus. I wanted to get an action figure for a friend, and I loudly commented as they greedily stuffed every single thing off the pegs into their cart that my 5 year old niece would be going without.

I ended up with the toy, but I can't remember how. Either an employee fished one out of the back or the guy felt a pang of guilt.