Okay, so it's well established that nothing stops the Juggernaut. Well then, what happens if he should somehow find himself on a treadmill? Yes, it's a silly little gag, but it's like that airplane/treadmill argument.
(For the record, yes, it would take off. If you think otherwise, you lack a fundamental understanding of how airplanes work.)
While there is an actual toy treadmill, this isn't it. It was released on July 4, 2001, with the DC Direct Flash/Kid Flash set, but since no one we know has that set, this required some improvisation. And no, it's not Photoshop: the pieces come from the GI Joe MASS Device - that's the hand truck used to haul the power elements around, resting on the machine's inverted treads. Juggernaut (from the Superhero Showdown line, ToyBiz's brief forray into the 3¾" scale) is really standing there, supporting himself with the "railing."
The quote comes from The Jetsons, of course. We considered making him cry "Jean" instead of "Jane," but why would he call Marvel Girl for help?