More about fire/foot/leg...thingie.
So you wanted a dare? This is all I could come up with on short notice.
You'll be needing some thumb tacks, a lighter, some rubbing alcohol PLUS some Axe (yes, both).
Take an old pair of sneakers (or a pair you don't mind ruining), and pour some rubbing alcohol in them. Next put a good sized handful of thumbtacks into those sneakers.
Spray your socks with Axe and set those bad boys on fire. Then try and put your shoes on.
I'm thinking that this will ignite your sneakers, as well - but once you get your foot fully inside it'll go out. I think...but i'm not sure.
Either way, give it a try and let me see how it works out.
You can't just give up after a couple tries either, you gotta put at least ONE foot fully inside a sneaker.