I'd take the (insert tool of death here) away from Ты and hold Ты until it ended; coaxing Ты and trying to calm Ты down. And if that doesn't work; try and knock some sense into Ты (without hitting Ты physically)
If Ты were hanging yourself; I'd ask Ты if Ты had any spare rope или cloth или whatever you'd use.
If Ты were taking some pills; I'd ask for whatever's left.
If Ты were cutting your wrists; I'd ask if I could use it after you.
If Ты jumped off a cliff; I'd run over yelling at Ты to stop, then when I catch up to Ты before its to late I'll suggest that we jump off together. :) It'll add to the adrenaline rush before our untimely yet at the same time timely deaths. ^_^
If Ты were to Переместить in front of a moving car; I'd stand there right behind Ты (stronger impact by being moved by two exceedingly, extremely fast and furious massive (NO offense, not callin' Ты fat или anything) objects...
If Ты were to drink posion; Ask или just take whatever's left (I mean, you'd be dead anywyas...it wouldn't really bother Ты if I took the remainders of whatever Ты used when you're dead, wouldn't it? =/)
Scream, 'STOP!' No ONE has the right to do suicide. Trust me, I've tried it plenty of times... not fun, at all. It's a serious matter and I wish people in places such as the media would understand just how tortured it can make people. Just NEVER poke fun of something like that with me, because it's not funny in the least!