Ren's Nightmare
 

This movie makes no sense at all, literally. It's my first, and yeah, it may be dog crap, but I tried.

McZee's Nightmare Clips
Video Game Nightmare
Video Game Nightmare 2
Timothy's Nightmare
Ren's Nightmare

I feel like I'm missing one or two.

You're missing way more then 2:

Doraemon's Nightmare
Sonic's Nightmare
A Nightmare on Nisa Street
Lumpy's Nightmare
Bongo Bongo Very Scary NightMare (great name btw)
Nakita's Nightmare
Yeti and Squidworth's Halloween Nightmare: Good Edition
Nightmare From Space
Domicile Destructo's Nightmare

That's like... 14 movies in total with the word nightmare in it.

Anyways, I agree with the post... This movie makes no sense. It's not abominable, but it's not very good. It's a good start though.