When we watched this video, we immediately understood what it must be like to be a hamster in a wheel...or a snake in a test tube.

The Germans have unveiled the first ever looping water slide - a contraption which looks like a big bendy rollercoaster but is in fact, a human canon. Sliders stand in the 'take off' pod, where a trapdoor then drops them into a vertical shute so slippy and steep they are propelled all the way round.

Not for fatties. Not for claustrophobics. And by the looks of the German clip - not for folk who don't wear nasty speedos. Have a chuckle.