Being as lazy as I am at the mo'- which is considerable- I won't look for the posters who stated that this kind of thing is run-of-the-mill for military types. That might be true for the guys actually in the helo at the time, it is not so for those higher up the food chain. back in '98 a Canuck Griffon crew decided to fly under the Confederation Bridge between New Brunswick and Prince Edward Isalnd provinces. With thousands of witnesses, their gooses were cooked. Both were suspended from flying during their courts-martial, their punishment after having been found guilty was to both be placed back in the left seat for "further training". Basically, their careers could have been ended right there.
Witness also an Apache crew at low-level: pilot asks gunner if they can whiz through a certain bunch of trees. Gunner says NO. Pilot says "oh yea of little faith". Next thing you know, blades start flying off, along with some very large branches.
Fun? Sure. But smart? Not usually.