I'm just kidding; that's a terrible idea. Funny, but terrible. Only do it once, purely for the humor value, then concentrate on downing the boss. Okay, maybe twice.
If you've run a heroic in Cataclysm, you may have noticed something: Nobody's healing you. In Wrath, when I'd take my holy pally out for a spin, everybody got heals. I was healing the tank, the off tank, the off-off tank, the DPS, the other healers, the hunter's pet, the death knight's ghoul, the guy standing in the fire ... they all got heals. Now? Not so much.
These days, healers spend 75% of their time healing the tank and the other 25% praying that their mana bars will go back up. That leaves exactly 0% of their time to spend on keeping your mage alive.
We're on our own, guys. When you see your health bar start to drop in a Cataclysm heroic or raid, just know that it won't be going back up any time soon. Our survival as DPSers is squarely our own responsibility. And what's the first rule of magehood? That's right: Dead mages do terrible DPS. We need to stay alive, our raid needs us to stay alive, and the only way that's going to happen is if we do it ourselves.
"But Christian," you might be saying, "I'm a mage! I wear a dress into combat! A particularly vigorous sneeze could kill me." Those things are all true. But you do have a few tricks up your sleeve that can help stave off death, if not forever, then at least long enough to pump out a few thousand more points of damage before you port up to that last great mage table in the sky.