A bit of background; my first bird was a peach faced lovebird named Fileet who lived to be 17 1/2 years (most clock in at 10-15 years, so he was quite the old man when he passed). He bonded with me immediately when I got him and it wasn't long before I could do all sorts of things to him and he'd just go all passive.
I'd bring him with me on trips to the pet store and the cashiers got a kick out of offering him millet, which he loved, and having him eat straight out of their hand.
Well, it's inevitable that someone would try to cause trouble.
Fileet was riding on my shoulder as I made my way through the store. About halfway through, a woman eyeballs me and then runs over to one of the workers, having a harried whispered conversation as she was pointing at me. Huh boy.
I got the bag of bird food, and made my way to the front, along with two sprays of millet in a baggie.
The lady (I forgot to mention, this is not an employee, this is a fellow customer) planted herself at the end of the register, folded her arms and demanded to know how I "got the bird out of its cage."
Cashier: "Ma'am, I told you already; that's her pet."
Customer: "Seriously? How the hell do you know? Can she prove it?"
Cashier: "Well, for one thing she's a regular, and she comes in here all the time with that bird. For another, we sell Budgies and Sun Conures. We've never sold a lovebird in this store."
Me: "As for proving it..." I flipped Fileet onto his back in my hand and, using two fingers, stroked both sides of his face.
This was normal behavior with me, and he immediately went limp, closed his eyes and tilted his head back in total bliss. Face scratches were one of his favorite things.
Cashier: "Oh wow! That's so funny! That definitely proves it, ma'am. Our birds would have bitten the heck out of her for that. Birds only let people do that when they trust the person completely."
I flipped my bird right side up, paid for the bird food and headed on my way. Fileet loved the millet, of course.
The lady looked completely stunned. I wasn't mad, really, since it's good that a customer didn't want some creep to try smuggling animals out of a store... but Fileet was in the open and staying quite contentedly on my shoulder. It's not like I was being sneaky with him.