Short Hand: Mister Dantive

Shepherd was invited to a private party by Pinkie Pie. This wasn't really unusual. It was unusual for her to not be greeting him in whipped cream and chocolate sprinkles. Instead, she had a strange metal cylinder dressed up in a party hat.

Pinkie: "Hi Shepherd! Look who I found! Out in the dump of human artifacts! This is Mister Dantive!"

Shepherd: "Dantive?"

Pinkie: "Yeah! It's what's on his name tag!"

Shepherd examines the cylinder, wipes off some tape and gunk on the labels...

Shepherd: "Danger: Radioactive..." He calmly grabs Pinkie and jumps out the window

Pinkie: "ACK! HEY! YOU CAN'T LEAVE THE PARTY!"

Shepherd: "Unless you want to throw parties only in the cancer ward at the hospital for the rest of your life, we're leaving!"

Later...

Twilight: "So, good news, it isn't emitting radiation! I mean, harmful radiation. It will only do that if it's broken or detonated!"

Shepherd: "Wait, wait, what do you mean... You mean it's-?"

Twilight: "Well, if you detonate the explosives inside it to implode the heavy element inside, it will undergo nuclear fission and release a massive explosion."

Shepherd: "So... It's an atomic bomb."

Twilight: "Implosion device is more accurate."

Pinkie: "Ooh! I'm naming him Mister Boom Boom!"

Shepherd: "We are not naming the atomic bomb anything."

Pinkie: "Don't be rude to Mister Boom Boom! He's an Earthling too!"

Shepherd: "Pinkie... Do you know what an atomic bomb is?"

Pinkie: "I do know he probably doesn't like being talked about like he isn't here!"

Comments

[Hazey Logic]

Nice Kragle joke.

[Spiritus Arcane]

And that's how Sugarcube Corner was closed for a week for decontamination.

Also Pinkie got superpowers, but no one really noticed because it was Pinkie.

[Steakthedog]

Atomic. Implosion. Warhead. THAT’S FUCKING DANGEROUS GTFO NOW!

[Eroraf86]

Technically, an implosion-type fission device will only properly detonate if all the external explosives detonate simultaneously, so breaking it open won't result in a nuclear explosion. At worst, it would be a "dirty bomb" and render the immediate vicinity uninhabitable.

[Blade Star]

The lack of either Pinkie or Applejack jumping on the bomb and riding it saddens me.

[FanOfMostEverything]

Ah, in the tradition of V-ger and Calima. Probably best to leave that one in the strategic stockpile, along with Celestia's war trophies and the dark arts and crafts of earth pony magic.

[FoxyLove]

Mr. Boom Boom is probably having a blast at the party.

Also Pinkie Pie probably had this song playing in the background https://youtu.be/sLqdRmwY6vc

[Herald of Opera]

5565770

At worst, it would be a "dirty bomb" and render the immediate vicinity uninhabitable.

Which is exactly what Shepard was afraid of; the immediate vicinity was full of ponies so that's far too awful for you to get away with an "at worst" there!

[Rokas]

Mmmm, nukes.

[Nyerguds]

I mean, the Demon Core was absolutely lethal from just slotting its pieces together...
https://en.wikipedia.org/wiki/Demon_core

[Ardashir]

I'd recommend sending it off to the Dragonlands. They're already a ruined wasteland and the dragons can probably handle a little radiation.

Then again, a 500 ft. tall Garble who can suddenly breathe atomic fire may be a bit much.