I'm doing a shop at a Bank of the West (which has since been absorbed by some other bank) where I have to interact with a teller for some sort of goofy non-customer transaction. I then have to stand around in the lobby until someone interacts with me and asks if I need additional assistance, and I proceed to a personal banker's office to inquire about some type of account.
While I'm looking like an idiot standing idly in the bank, I look around to see what marketing materials are present, which is part of the shop guidelines. They have a security officer on duty, and he sees me looking around casing the joint. He looks me up and down and even goes outside to check out my vehicle.
After I'm done doing my account inquiry I leave through a different entrance/exit door that I used to enter the bank, for some reason they had 2 available entrances/exits. That made me more suspicious to the security person on duty.
Later that day I go to play cards at a local bar in a card league that I am in. Our regular server at the bar works at a different bank. She comes up to me immediately and says, "It was you wasn't it? It was you that was at the Bank of the West, wasn't it?" I told her, "Well yes it was!"
After I left the bank they put out a description/pictures of me and my vehicle to all the other local banks on some sort of interbank security watch notification network. My friend the server replied on the network saying NO NO NO I know that guy he does secret shopping!
For a short period of time that day I was a suspected bank robber, fun times!