WHY WOULD YOU DO SOMETHING LIKE THIS!!
 
THE BARRIER BETWEEN WORLDS IS ALREADY WEAK ENOUGH!!  
THIS WILL SHATTER IT, YOU FOOL!!!!
 
WHAT HAS SCIENCE DONE!?!?!?!?!?!

Pinkie Pie, definitively. Because otherwise she’ll turn into Pinkamena Diane Pie and it’ll be your turn to have “special cupcakes”.
 
… Plus she has party cannon.