The first thing that popped into my head was a Lego mini-figure.
But if was actively trying to come up with the least threatening thing possible? Maybe a cotton ball. Or a single grain of sand.
See, if we’re really going with the very first thing that pops into my head, then we’re all boned, because the first thing I think of asked an open-ended question is generally “ninjas”. If I were in charge of the decision, we’d all be doomed to evisceration by katana, shuriken, piano wire, or inverted spinning wall kick. But hey, if our destruction’s inevitable anyway, at least it’ll look pretty cool.
Now, give me an arbitrary choice between preselected options, and my gut response is always “the green one”. So, if I were to choose from among other posters’ responses…looks like we’d be drowned in a sea of lime Jell-O. Sweet, tasty, wobbly oblivion.
Batman–if I’m prepared.
I would like a straight answer to what is going on on that Lost island, that would simply blow me away.
Soylent Green is made of people.
/drunk
A pie! An apple pie! (please don’t kill me!)
One molecule of water.
A wave of orgasmic energy. :eek: :o 
My immediate thought – Cecil Adams.
The SDMB itself. All will perish as they’re drawn into endless discussion and debate and forget about such basic necessities as eating and sleeping.
When I read the title, the first thing to pop into my head was the Stay Puffed Marshmallow Man, but we already know what to do with him.
If I chose, I’d say a guy with an ass where his face should be.
You haven’t seen very many Japanese horror flicks, have you? It wouldn’t be a tiny garden snail – it would turn out to be a slow-moving 200 foot high monster with an impenetrable shell that left radioactive slime in its wake and shot laser beams out of its eye stalks.
Boobs. What?
Or Godiva toasted almond truffles. Mmmmmmmmm.
That just made me a little wet. Bravo.
We could call it Snailzilla, or Ceuphalodon.
I’m actually surprised no one has said J. Edgar Hoover. Because I was going to use him as a hypothetical example. Then, just by thinking of that example, J. Edgar Hoover would appear and destroy us.
I would probably start thinking about all the nasty things I’m NOT supposed to think about, and so would doom us all. Like so:
"oh, mustn’t think about aliens, AW MAN, no… ahm… rabid dogs, in the millions… NO, dammit… ahm… (think, think) VAMPIRES-must not think about vampi this is where I die from the millions of rabid vampire aliens.
Sorry. :smack: 
Escargodon…?
I applaud yo taste.
And she’s a local girl, too boot.
I can see it now.
