FREE Software For Youtube Poops?

Hello! I am a Youtuber and I am working on my first YTP, or Youtube Poop. Some that I have seen on Youtube are very funny, some are not. I would love to make a funny one. :) I want people to laugh while they watch it. Some effects I would like to do are taking clips and rearranging them so that the character says something different, switching colors in the video, making audio/video go backwards, etc. What FREE (maybe trials, but I am not going to pay) programs/softwares should I use to make a FUNNY, not lame, YTP. I have Windows Movie Maker (WMM), but that is not working out too well. It is very hard to do it on WMM. So, please give links with your answer. Love ya! xoxo