U vs Usain was an idea for Visa to run during the London Olympics. It nearly happened... but not quite.
The idea was to build a 100m long digital billboard, along which you'd see footage of Usain Bolt running 100m at world record speed (9.58 seconds).
Alongside the screen, would be a proper running track so people could try their luck running 100m against the fasted man in the world. In the incredibly unlikely event that anyone actually beat him, Visa would've paid out a £10m reward.