Ex-retail workers of Reddit, what was your worst experience with Karens?

I worked in retail for a few years and there were always those customers that we called “Karens.” You know, the entitled women who would come in and demand things or throw fits over trivial matters. One time, a Karen came into the store and wanted to return an item without a receipt. We have a no-receipt policy, but she started screaming and yelling at us, saying that she “knew the manager” and that we had to take back her item. She caused such a scene that the manager ended up coming out and refunding her, just to get her to leave the store. As she was walking out, she said “See It pays to know people!”