Happened a few years back in college. I worked the customer service desk when a old lady came in carrying a filthy vacuum cleaner.
Old Lady (OL): " I need to exchange this, it broke and now I want you to replace it"
Me: no problem. do you have your receipt?
OL: (getting short and snippy) no I don't have the receipt. Why do I need one I'm literally standing here with the vacuum! huffs
Me: OK, well I can also look up the purchase if you used a credit card or happen to have our store discount loyalty card.
OL: How should I know how I paid for it, I was here 3 years ago.
Me internally: What the fuck..
(At this point im punching in the vacuum code into our system and see we have never carried this product)
Me: OK well our return policy is 30 da...
OL: WOULDN'T YOU EXPECT A VACUUM TO LAST MORE THAN 3 YEARS.. DON'T YOU THINK A VACUUM SHOULD LAST MORE THAN 3 YEARS
Me: let me call the manager for you
Manager came up listened to her explain to him how she got a vacuum here, it's broken, 3 years later, no receipt etc. I talk to him on the side and show him how that brand has never been sold here.
Manager facing the customer: do you remember about how much you paid for it?
OL: I don't remember, maybe around 150 dollars
Manager: OK let's go find you something comparable to exchange this for
I stand there dumbfounded and finish my shift in utter disbelief.