When employees of a retail establishment constantly ask you every thirty seconds if you need help, when it is clear you don't.
Employee: HI! DO YOU NEED HELP FINDING ANYTHING TODAY?!
Customer: No, I'm okay, thanks.
Employee: OKAY, WELL LET ME KNOW IF YOU NEED ANY HELP, ALRIGHT?
Employee #2: HI! DO YOU NEED HELP FINDING ANYTHING TODAY? HAVE I TOLD YOU ABOUT OUR 30% OFF SALE?!?!
Customer: On second thought, no, I suddenly lost any urge to buy anything.
... is a textbook example of Retail Stalking.