Well, it's logical from his point of view

(Two guys leg pressing 650 pounds)

Jock: "...9, 10. All right, do your last set and let's get out of here."

Brainy Jock: (grabs two five pound plates and puts them on machine)

Jock: "What are you doing? Trying to one up me on your last set?"

Brainy: "No, I just want to make it an even 700 pounds."

Jock: "Uh, 650 plus 10 is 660, not 700."

Brainy: (ponders) "Shit. I'm thinking of time."

- Lifetime Fitness in Skokie

-- Submitted by Mike L.