The only salesperson that sticks out in my memory as being truly helpful worked in a store that sold sunglasses. I had been standing there for a few minutes trying on different pairs of aviator style sunglasses when she spotted me, stared at my face for a couple seconds, went and grabbed a pair out of a case, and asked me to try them on.

They looked awesome.

They cost more than I had planned on spending, but I bought them. No pressure from the salesperson.