At my old workplace there was one who someone made the mistake of feeding a few times. Got to the point that they couldn't leave any windows open or he'd come in and steal food off people's desks.
He got the nickname Steven Seagull.
There's a friendly seagull at our holiday house who has gained the name Steven Seagull. He knows his limits though, he just struts around on the lawn and front porch waiting for food, he won't enter the house, even if the door is wide open.