NASCAR driver Joey Logano doesn’t know how many pounds are in a ton

David Letterman and Joey Logano were having a real interesting conversation about NASCAR. Then this happened:

LETTERMAN: And those cars weigh like a ton, right?

LOGANO: No, maybe not that much. They’re maybe 3100 pounds?

Here’s a tip, kids: before you go on any talk show, please know your weights and conversions. Talk to you later, I gotta go read up on what the hell Celsius is before I go on Conan.

(h/t Extra Mustard)