What do you do when you have a seaplane without wheels, no water, and you need to take off? You put it on a trailer, drag it down the runway until you get the proper speed, and just pull back on the stick:

Damn, that's cool. I knew it was gonna take off and it still baked my noodle a little bit. I think this is why so many people (myself included) had trouble with the airplane on the treadmill question. All that really matters for takeoff and continued flight is the speed of the plane relative to the air -- how it gets to that point or what the surface is doing isn't really relevant -- but when you're observing it, it seems impossible. (via @deronbauman)