My dad was always into muzzleloading rifles, and has his own civil war cannon, so my brother and I always had access to gun powder. He taught us how not to blow ourselves up, with the rationale that we were going to do it anyway. He let us blow all kinds of stuff up, we just had to prove to him we had a clue what we were doing first. The nearby corner convenience store sold printed foam gliders. I thought they were pretty neat. You could hollow out the space under the wing root, stuff a fire cracker in there, give it a shove and watch it get "hit" by imaginary AAA. I specifically recall a MIG-21 that was all red that exploded very nicely over the backyard. Score one against the commies, I said!
As a teen after my brother went off to be a ICBM launch officer (he never got tired of the idea of making explosions, I guess), a good friend of mine gave me one of those large-scale balsa and fabric-covered RC airplanes. This one was a P-38, never had engines in it and it had I recall about a 3 foot wingspan at least. I really should have filmed this, but I added weight to the engine areas and the nose to balance it and climbed up a tree a few times to get it gliding just right. Then, I filled the wing roots with black powder, soaked the wing roots in gasoline, placed large fireworks under the wings and replaced the "rocket pods" with bottle rockets, built a giant slingshot and launched it over a giant sand pit in flames. A bunch of my friends showed up, and we cheered as it sailed out over the fit, flaming and popping away, then
WHAM, a giant explosion as the centerline charge went off. The only thing left as the wingtips and the tails. Nothing else.

It was a heck of a sight. Years later, I was reminded of that scene in "Flight of the Intruder" where the A-6 sails along in flames and then explodes. I deeply regret I didn't find a video camera to film this with but we didn't get one until a couple of years later.
I found the definitive pop-culture reference to this kind of thing. Look here:
http://picayune.uclick.com/comics/ch/1986/ch860421.gif