Doesn’t Know The Elementary Truth

(My friend and I are settling in to watch the new “Sherlock” series, which we’ve heard good things about.)

Friend: “What’s Sherlock’s first name?”

Me: “Sherlock. His last name is Holmes.”

(I look at him pointedly, waiting for his reaction. He stared intently at the TV until he comes up with an excuse.)

Friend: “That was a test. You passed.”