"Come on girls, we're gonna dig a hole!" Pinkie exclaimed.
"A hole?"
"A whole hole!" Pinkie cheered.
"Why a hole?" Rainbow asked.
"Technically a hole is always whole." Twilight said at the same time.
"We dig a whole hole, we fill it with poisonous poison, and spikey spikes, and then we lure the princesses into it!"
"Pinkie... they can fly." Twilight corrected.
"Not if they're too shocked to use their wings!" Pinkie singsonged.
"You know, you are surprisingly logical sometimes." Twilight said staring at her pink friend.
"I know, now help me dig!" Pinkie threw shovels at the other five, leaving them briefly wondering where they'd come from.
"I still think we coulda just snuck more poison into the pie." Applejack muttered.
"Nope!" Pinkie responded popping up by Applejack.
"Ugh, fine fine, my plan was terrible, happy?"
"It wasn't terrible! We just didn't account for the variable of the princesses being immune to cyanide, I mean, who woulda guess that?" Pinkie giggled.
"Twilight." Rainbow Dash answered.
"Hey!"
"Well it's true!" Rainbow retorted as she tried to dig quickly.
"Not even I can account for every variable Rainbow Dash. I thought years of friendship would have taught you that by now."
"Yeah but you're usually close you egghead." Rainbow teased.
"Rainbow! You're getting dirt all over my face!" Applejack scolded. "Watch what you're doin'!"
“Okay, I think that’s deep enough. Where’s the acidy poison?”
“Right here.” Twilight hovered a carefully sealed barrel over the hole and uncorked it, gently pouring some acid in.
“Are the spikes dissolving?” Twilight asked.
“Nope! They’re perfectly perfect!”
Twilight carefully poured in the rest so that they would not be splashed by the acid and then Pinkie and Applejack drug a tarp over the hole. Fluttershy and Rainbow Dash then carefully swept dirt and debris over the tarp to hide it.
They did a terrible job.
Bits of twigs and clods of dirt were scattered over the blue tarp, still easily visible. They'd have to hope the princesses just weren't paying attention.
"Okay Pinkie, go get them, tell them, I don't know, we've got a statue in their honor or something." Twilight instructed examining the pitfall closely.
"Okey dokey lokey!" Pinkie bounced away.
As Pinkie reappeared bouncing along, with the princesses following, the others carefully stepped just behind the hidden pitfall.
"You really think this'll work?" Apple Jack asked.
"It can't be worse than poison." Twilight teased.
"Hey! We didn't know they was immu-"
FWUMP
"Oh dear!" Celestia landed by them while Luna careened into the hole.
"Oh no! There was a pitfall?" Twilight exclaimed rushing to the edge.
She peered into it to see Luna impaled by the spikes, and being dissolved by acid.
"Sorry Celestia, your sister is dead." Twilight stated matter-of-factually.
"Oh, well that's a shame. I guess it's back to ruling alone." Celestia shrugged.