Another Brush with Crazy at the Door

IF I was worried that I could only have brushes with crazy when I'm out and about...say, at the dog park or coffee shop...well then, that fear was allayed tonight.

Doorbell rings.
Me: Hello?
Random Guy: Is Bill there?
Me: No. There's no Bill here.
Random Guy: Bill??!! Is that you??
Me: No. There is no Bill here. There's a Bill next door though. Black door on the left.
Random Guy: Where?
Me: NEXT DOOR! The black door to the left.
Guy: The black door to the left?? Where would I find that?
Me: [silence] [pounds head on wall] [why me?]