How long is a 5 inch inseam?

So, I get a phone call today, and the customer (who is a guy, but I spent the ENTIRE time thinking he was a woman) starts asking questions about our men's running shorts.

Customer: "How long are the 5" inseam shorts?"
Me: "Uhh... what?"
C: "Like, how long does it go down your leg?"
M: "I guess it depends on where you wear them and how long your legs are..."
C: "Oh. Ok, let me ask you this: Do they reach down halfway down to your knees?"
M: "I guess it depends on where you wear them and how long your legs are. They are our shortest running shorts. The seven inch inseam shorts typically reach halfway to your knees, while the nine inch reach just above your knees." Did you really not just hear me say that?
C: "Ok, so the seven inch reach your knees?" Did you really just ask me that? Like, for realsies?
M: "No, they reach halfway down your thigh. It's the nine inch that reach your knee." Sigh.
C: "Ok. Yeah, nine inseam reaches your knee. Do you guys sell four inch inseam running shorts?"
M: "Five inch is the shortest our store carries the men's running shorts." Didn't I already tell you this??
C: "So if I'm 5ft 8", where will the five inch shorts come up on me?"

And the best part? He called back again! And I had the joy of answering all of his questions. Again.
And yes, it really did go on like this.
And on.
And on.
And on.