All you really need to make a cool and memorable movie that's perfect for becoming a YouTube sensation is a camera and a cute idea. You don't need props. You don't need a perfect script. You just need a camera and a good idea, nothing else.
Trust me, anything flies. There are videos out there depicting people's cats being cute. There are videos out there of some guy dressed up as Batman doing ordinary dad stuff. There are infinite videos out there of clever hidden camera situations. There are videos out there of water balloon pranks. All of those have been hits in the past.
In the end, all you really need is a cute idea and a rough vision of how to turn it into a video. Turn on the camera, make it happen, upload it to Youtube, and share it with your friends. It probably won't go anywhere… but it might.
You'll never know, though, until you spend an afternoon with a camera making a video.