You know you drank too much when

A long while back I had this customer:

He came in, and sank in to the usual back-seat corner. 

"9th and 30th street." 

I don't remember where exactly, but that's a good example. Then he told me this.

"Where'd Alan go?" 

"What?" 

I said, after I looked back and saw him staring right at me. 

"Where'd.. Alan... GO?"

"Uhh.. I don't know... What you're talking about sir?" 

I didn't know weather I should laugh, cry, or shit my pants. 

There was a long pause, about a minute. He looked at me, slumped further in his seat and said, 

"Fair enough." 

I guess I won this round of, am I crazy or just messing with ya.