Perhaps the worst the invention ever?
http://www.burbia.com/node/2113
"Sometimes you come upon something so ridiculous, so on-its-face laughably stupid, you just want to stop everything and enjoy. That's what we did when we first saw this investors-demo video of SpeedFit, a new concept in exercise technology:The Mobile Treadmill...a treadmill designed specially to move/walk down the street while you're treading."