What is the dumbest thing a Makeup SA has told you?

A few weeks back I was looking for a black kohl pencil,I went to a high end drugstore brand and swatched a few kohl pencil.An overly painted young SA enthusiastically rattled all the virtues of the kohl to me like a pretty parrot.
Here's how the conversation panned out
Me-"is this eyeliner safe for wearing on my waterline?"
SA-"yes Ma'am it's safe, it is waterproof,smudgeproof,will last for 12 hours on your eyes"
Me- (looking confused)" do you know what is Waterline?!"
SA-(brimming with confidence) "yes Ma'am Waterline- is when you apply eyeliner and your eyes start to water- that is called Waterline!"
Me-I looked flabbergasted for a moment and then I burst out laughing!!
Well I wasn't trying to be mean but that was honestly the dumbest thing I had ever heard!!

If you've ever been told the lighter foundation shade will make you fairer, or you don't need a moisturiser 'coz you have oily skin, or you SA sold you a lip liner as an eyeliner
It's Payback time, this is your chance to finally vent,rant and let it all out. Go ahead and tell us all what's the dumbest thing a Makeup Sales Associate has said to you?