He's a helluva pilot. I find those kinds of flights very funny. It's like the plane/heli is having a spasm!! It takes a lot of skill to do that and a lot of guts because the plane is worth a lot of money too.
In answer to Gommer - it's to do with power/weight ratios. That model is extremely light (although it doesn't look it) and it has a very powerful motor in there in relation to its size. Real planes don't have that same ratio so it wouldn't be possible.
It's the same with helis. You see these guys throwing them all over the place and if anyone was inside, they'd be unbelievably sick to say the least.