h a l f b a k e r y
Point of hors d'oevre
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You press a wireless remote and small blades swivel out of you shoes(or maybe it has to be one shoe at a time, so you can lift your foot). The blades give you a grip on ice.
||Sort of on-demand crampons. I could see this being useful, although I wonder how long it would take the violently-minded to use them as weapons.
||Yes, quite bad for airport security.