They make my day sometimes because of their sheer stupidity. For example, I had rung up a grande unsweetened PTL for this chillun. Smiled and made her way with her drink. Later, her mother storms in with RAGE.
Mom: This is SOUR!
Me: Sour? What do you mean? It's not sweet?
Mom: YES! /shoves drink in my hands.
Me: .. /reads cup. This is an unsweeted passion tea lemonade, m'am.
Daughter: /runs in, beet red in the face. Mom, I asked for that unsweetened! I'm sorry, she's crazy! /drags her Mother away.
I was in tears as soon as they left. Best thing that happened last night. XD