Not sure if all of you know this, and this is based off of default controls. It takes little practice to do it. It's useful for if you got a bad spawn, or broken legs and nothing to jump off of or shoot yourself with.
What you're supposed to do is press F10, F11, F10, and rapidly click. Don't stop clicking till you die. Please note that you should press f10, f11, f10 in that order, and within a second. And just spam click till you drop dead. You'll see your person kneel down, raise his right arm, turn around his palm and suddently you'll drop dead. If it didn't work, try again and try clicking faster.