Ok, so, you're evil and going to kill everything, we get that

[Mr. Elemenopee]

My button is my belly button. It's so simple yet not many people would make that connection.

Also my button would just set off a Rube Goldberg type of reaction in cities across the world. So when everything is being destroyed around them people will still be able to "Ah" and "Ooo" while their impending doom is upon them.

 

[SalamanderJoe]

The carhorn from a 1969 Morris Marina.

 

[Mr. Mxyzptlk]

i wouldn't use a button :3
i'd use one of these huge frankenstein-like switches

http://cache.wists.com/thumbnails/3/0a/30a1e248cf3c663191b33c4d591ebe93-med
(don't know how to upload pictures :S)

 

[Sebenko]

male gentiles,

Shaped like a male non-jew? How creative.

 

[Emilox The Great]

A grey blue button, that I drop kick to activate.

It releases millions of nano bots. The bots go into the brain and they emit Justin Beiber songs non stop, forcing everyone to kill them selfs.

now thats just TOO evil!



OT: my button is a big green shiny one, and it is placed in the middle of the hideout. what it does? theres only one way to find out...

 

[David_G]

It will be nano-size, and it will be inserted into my heart, and will activate when either my heart is removed from my body, or it stops.

 

[Macgyvercas]

My button would be small and inconspicuous to everyone except me. There would also be a large red button marked "DOOMSDAY DEVICE CANCELLATION". It would trigger a spray of bullets on any hero stupid enough to press it.

 

[Withall]

The button would be the default stereotypical one: round, red with a glass cover, with a nifty key-lock. The button would trigger the breakdown of certain amino-acids in selected cities and latitudes- keep the infrastructure intact, while solving some other problems...

 

[Urgh76]

Spoiler: probably this

See that gigantic door in the background?

That's not a door, It's a button!

EDIT:

Spoiler: Or maybe this

 

[SwagLordYoloson]

Red, Huge, and Self Destruct is written on it

 

[Tim_Buoy]

mine is the size of a doorbell button and is installed next to my actual doorbell if you push the wrong one you will end the world not me and i will laugh at you

What If i Knock?

well than you have foiled my plans once again mr bond

 

[Hap2]

A middle finger salute! What else could my button ever be...

 

[icyneesan]

male gentiles,

Shaped like a male non-jew? How creative.

*Genitals

There now leave me and my spelling mistakes alone D:

 

[Arawn.Chernobog]

A chocolate muffin...

Not just any chocolate muffin too, the damn tastiest one! And I'm going to ruin it by pressing down on the button it's covering right before the city gets intoxicated

 

[Kermi]

The button to activate my doomsday weapon will be a simple console button.

The button to deactivate it will be a 10 inch dildo that constantly ejaculates wasabi, that can only be toggled via deep throating.
"No Mr. Bond, I expect you to gag."

 

[Irony's Acolyte]

A non descript TV remote. One of these buttons will complete my plans for this new Earth of mine. You could say it is a weapon but all that matters is that by the time I press it, I've already won.

 

[GodofDisaster]

My button will be shaped like this.

Spoiler

With the words "You're going to see some serious shit by pressing this button, printed underneath."

 

[Shoqiyqa]

My buttons are in a console that is so much like a friendly, horny, 19-yr-old Cindy Crawford that you'd never know the difference. Touching both nipples at once starts the count-down. She'll be saying the count-down.

The disarm button is her G-spot. Good luck, "hero." MUAHAHAHAHAHAHAHAHAAAAHAAAAAAAHAAAAAAAAAA!!!!!!!!!

(If this is an episode of Inspector Gadget and his niece has to solve the puzzle for him, that's going to be really awkward, isn't it?)