Usain Bolt is as tall as Calvin Johnson(notes) (6-5) and he's faster than any human, ever. Thus it shouldn't be a surprise that we occasionally speculate about his NFL potential. The world record holder in the 100-meters and 200-meters would probably hold his own at the combine.

In fact, Bolt would likely shame anyone else who's ever competed. After reviewing 20-meter splits from the world championships, ESPN track and field reporter Larry Rawson declared that Bolt would run an NFL-style 40-yard dash in … well, in an absurd time. Almost inconceivably low. Way less than four seconds. You can listen to Rawson right here. These were his comments: