There's been attempts, but ultimately I normally deliver the pain as opposed to receive it.
Although I did once have a tremendous argument with a high school teacher of mine about whether it was "manly." I explained that the impact required to knock a person out is the same that it takes to kill, and that the older we get, the more force we can apply, meaning that not only does death via blunt trauma become a more likely scenario in a fistfight as one ages, the likelihood of severe and long-lasting injury rises as well. Given that, if I fight a ************, I'm going to do whatever it takes to come out unscathed.