My brother had a funny story about this. His friend worked in IT and was doing one of those system things that take all day and take the system down. He wasn’t supposed to let anyone in the building during this. So an executive comes to the door, his key card doesn’t work, he buzzes the bell. The guy inside answers, and says he can’t let anyone in. Exec says “Do you know who I am?” and the employee responds with a tentative “well, do you know who I am?”

“No”

“Ok, I can’t let you in.”