I've been guilty of that.
It was near the end of a campaign, and we had to storm a castle on a precarious cliff side. We stormed the gates with our NPC forces over a bridge that if spanned over nothingness. If you fell, it was pretty much a death sentence. Lo and behold, as we started hitting the gate, the giant golem statue animated and started wreaking house. The thing was pretty tough, since you couldnt crit them and any smart super villan put wards on it to keep em from being instagibed. In essence, it was supposed to be a fight on par with any of Kratos v. what god. You climb the thing, hit runes on it, trip it up or something.
I had a few beers so I wasn't thinking in my right state of mind, and I thought I had a brilliant idea. I said "Fuck this noise." and promptly cast a Disintegration Ray at ground around the golem's feet. The ground that was a bridge over nothingness. Huge boss fight that's supposed to take the rest of the night is over in like 10seconds and I got everyone looking at me like I'm bigger that Gandalf. Everyone just laughed the rest of the night thinking about where this golem fell to and how it probably dropped on a couple goblin guards pulling night shift.