For every time you've brought a scooter to the airport and wished it fit into the overhead compartment, I give you the Nexus: a battery-powered scooter that folds into a luggage-sized case. The TSA will love this.
Nexus is a concept designed by Francisco Lupin, and if it were either a) for sale or b) not guaranteed to get me arrested, I'd own one already. Its two electric engines run on four 12V batteries, and can achieve speeds of up to 15 km/h. It'll last two hours on one charge, though if you make it two minutes before being tackled by bored security personnel you deserve some kind of special award. [Tuvie via Dvice]