hmmm..so many to chose from...it'd have to be....
making a 3D hydrofoam aircraft with only experience in flying the old cox 049 control line planes,,,i got it about 3ft from the ground then crashed it
another silly mistake was cutting my finger on my RC airboat (28cc 40" hull gasser) propeller when it wasn't even installed on the boat yet
jumped over a bunch of kids with the revo then purposfully landing on one of em