Screening process? You mean the hopper? Some stuff gets put up, some stuff doesn't, the votes and the chronology of the submissions don't really seem to matter at all. I've tried to understand it, and failed.
This clip doesn't even have any sound or...anything.
I'll follow the logic supported by everyone else around here so far; this is pretty funny though, in a "Well, I like to see toddlers do stupid things" kind of way. Here's an extra star.