I almost sent that first one to the moon, but after about 10 seconds I was hooked. It's actually really well done.
Either that, or Twilight Sparkle in a robe and wizard hat is awesome.
I'm really liking the third one too. Pinkie vs. the space program is an interesting idea.
1.) Nightmare Night: The Silent Film
2.) Civilization WITH PONIES
3.) Pinkie Visit the World