Contorting yourself into a coach-class seat is bad enough, but only serves as a prelude to your frontward neighbor hitting "Recline" and savagely kneecapping you. Take back control of your airborne space with Knee Defender. A victim of both gangliness and air travel, former Capitol Hill staffer Ira Goldman developed these pocket-sized clamps after far too many patella-smashing cross-country flights over campaign trails. Deployment's simple: the two KD pieces attach to your lowered tray table arms, forcing the seatback in front of you to maintain a more (or entirely) upright position. Naturally, the discreet devices are made of plastic, so they'll make it through security even when you volunteer for an all-cavity body search. Of course, no gambit's without risk, and there's always a chance that an observant traveler/gadget freak will discover this clever little land grab -- once again subjecting you to potential kneecapping, only this time from a speeding, hijacked beverage cart.