If you pop it, aggro all dumps off of you onto the next highest on the threat table.
Which, as I know from personal experience, is almost always the healer...
My druid has been killed with this before, about 0.5 seconds after the paladin cast that spell I went down, but the spell is still up, so a second after that the mage went down, and then before the spell even wore off, the rest of the group was dead.
And then the spell wore off, and the entire set of the pull all turned and looked at the pally, who was now missing all of his backup...
Wipe. In under 5, maybe 10 seconds.
Never bubble, die first.
If you die, they'll learn their lesson just as well, but it won't be your fault.
And, quite often, a heal was enroute to you anyway. I know that if I'm your healer, you're not going down until I'm out of mana or I get stunned. The same goes for the healers in my guild that are on slowcast mode, like our resto shaman and holy paladin.
Just because your health is low doesn't meant you're dead. Only mostly dead. And the hero of Princess Bride still saved the day after being in that condition, so it can work for you too.

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