“Did I forget to shave?” was my clue that the OP is male.
How’s the weather on Mars this time of year? Does it get windy under that rock?
Way cuter!
I’m guessing she was making a joke about self help since you were asking for her help. She probably thought you were cute and was trying to get you to smile at her.
Or it was a passive-agressive swipe at customers who are too lazy to look for things themselves. 
Of course, as the OP tells it, she came and asked if he needed help, so neither of our theories holds much water. Unless she was psychotic. Then mine still might…
Its seldom that the wind blows under a rock unless there is some sort of opening through which the wind might blow. Otherwise, whoooosh?
I think you are pretty hot, in a clean-cut sort of way.
Maybe the clerk thinks hot people need to be taken down a peg?