Party of One is the twenty-fifth episode of the first season of My Little Pony: Friendship is Magic. It aired on April 29th, 2011 on The Hub.
Pinkie Pie wonders why no one attended Gummy's after birthday party.
This is the second time pinkie pie is shown with long straight hair, the first being two episodes ago.
This is the second episode in which Pinkie Pie can be seen flying the hot-air ballon; the first being Fall Weather Friends.
This episode triggered a meme. A picture of pinkie with really really messed up text.