When you see the mushroom cloud...

[D-C-P]

*wilhelm scream*

 

[Jedoro]

I'd press A, cause I ain't got time to smoke a bold

 

[esplode]

Use a formerly cool one liner that makes no sense in the current situation.

 

[Tales of Golden Sun]

I'll be thinking:

TERING.

 

[CMon]

I'd probably think something along the lines of; "Gosh, I sure hope it's the blast that kills me."

EDIT: You know, I rethought this and imagined the scenario in my head. What I thought was literally: "Uh. Wow."

 

[Harlemura]

"Where's that shovel? I gotta get me a bunker, on the double!"
I probably wouldn't even make it to the shed, but you get the idea.

 

[phi161]

"'Bout that time eh chaps?"

Spoiler: click for lolz

 

[Azraellod]

"ah, so that's what it looks like up close."

actually, i would probably look at it, think "...huh..." shrug, and then die horribly.

hooray for a relaxed attitude towards death.

 

[Lullabye]

"YAY! MUSHROOMS!"

 

[Mediteral]

"figures..."
I'd run to the most secure place I can think of.

 

[LCP]

Just great...

 

[Jedamethis]

Foolish Humans
*flies away on giant duck*

 

[PyroZombie]

I'd possibly;

"Oh yeah, I forgot about that."

"Well, I know it's rude but....I told you so!"

just draw a line in the dirt and dare it to cross.

I'd actually sit down and watch it and laugh.

 

[Spirultima]

"Hehe, took a while"

Possibly by instinct i'd put my arms over face before being incinerated.

Or gain a superpower, because thats what were going for here.

 

[Mighty Lighty]

OH GOD I DIVIDED BY ZERO!!!

 

[kiyeshi]

If I'm not riding the nuclear warhead, I'll either be inside a lead-lined refridgerator or kissing the girl of my dreams while wearing an owl costume.

[sub]please tell me someone understands the references[/sub]

watchmen. i demand a cookie

 

[Steambroom]

Run against the explosion wave with a huge sword, while roaring my battle scream.

 

[BlueTomfoolery]

I'd say some pun and start playing "Won't get fooled again" By the Who.