NASCAR rivals airborne in huge crash

Prost v Senna, Schumacher v Hill, Alonso v Hamilton - just a handful of motor racing rivalries that have gone further than the usual sporting 'misunderstandings'.

But those guys have got nothing on the world of NASCAR where, as the video shows, the latest feud ended up in a flying crash at 180mph after a deliberate retaliatory tap.

At the Atlanta Motor Speedway last weekend, Carl Edwards was running 156 laps down in the Kobalt Tools 500, so you'd think he wouldn't be concerned about putting in too much effort with seven laps to go. Not so.