I did something similar once, but mine was a homemade electrolysis cell (maybe I should sue these guys). I collected the H2 and O2 in seperate garbage bags. When the bags were about 1/3 full I mixed them in a third bag, stuck a (long) fuse in the end and let her go.
It went BOOM! The next day there were stories about a mystery explosion the night before. I just wandered along contentedly.
I had similar experiences playing around with calcium carbide and water as a kid. (This was shortly after WWII, and I got the carbide from my dad's welding trailer -- where he used it in his acetylene generator...)
Reminds me of how the welders I worked with "cleared the line" on a "big inch" gas pipeline through the NM desert:
They would squirt oxy-acetylene from their cutting torches into the upwind end of a 200' or so section of pipe. Then they would stand aside, shout "Fire in the hole!" and light 'er off.
The "WHOOMP" and the fireball on the ignition end was quite impressive. So was the scatter of smoking rattlesnakes, jackrabbits and kangaroo rats that went sailing across the desert on the downwind end of the pipe!
I wouldn't want to be anywhere near even a small FAE detonation!