What you are about to see here is New Orleans Saints quarterback Drew Brees guessing -- exactly -- just how inflated or under-inflated a football is. He appeared in 'Conan' this week and was asked to weigh in on the NFL's "problem" with football inflation.

Spolier alert -- he doesn't really give a straight answer.  'Cause he's smart like that.  But Conan gives him a few balls, and he nails their weights exactly.  That's why he's in the NFL and we're not.

And then he kind of embarrasses himself by trying to throw one of them to a fan in the audience ... and it's incomplete. Oof, that's gotta sting.