I used to have something similar to Heelys.. There were these shoes where the bottom had two spaces like cut out in them where skate wheels went. And there where buttons on the side. So you lift your foot press the little button and out pops...skating rink wheels! Problem was... they cost like $60 but broke before my converse got dirty(which was like the first school day... that's what you do to people with new shoes at my school.. you stand on them with your muddy shoes)