Season 9, Episode 14, "The Last Laugh"

https://www.deviantart.com/marybellamy/art/Pinkie-Pie-and-Cheese-Sandwich-804376080?src=MC_deviation_stack

Synopsis: When Pinkie Pie seeks help from her old friend, the super-silly Cheese Sandwich, in finding her life's purpose, she discovers the unimaginable has happened.

The Mid-season Hiatus is over. Back to more pony.