Fark linked up what may be the world's fastest shopping cart:

Wacky Andy Tyler sits in a 50mph shopping cart after fitting a JET ENGINE

With several pictures!

The thing is, I don't see a pump or turbine in it anywhere. Looks like he's burning propane, so fuel pressure won't be a problem. Still, can't quite see how it pushes forward.

Guess that means I'll have to build one.