A channel that I've found to be VERY funny is called WateringCanPro.
They are certainly what you mean by "unknown" (Less than 50 subscribers, less than 25,000 total video views). They upload a video every week, and are consistently hilarious! Their channel and my favorite videos of theirs can be accessed through the links below. Definitely check them out!
Chat with our AI personalities
ErlendWin's Channel includes a variety of funny videos from YouTube. The page is called 50 Funniest YouTube videos of All Time. Users can subscribe to his channel and watch funny YouTube videos.
its called youtube and type funny videos
search the jessikothe channel, or j bieber jessi. not many subscribers yet but truly the funniest videos I have seen in a while! The next Fred! also, search kittens by kittens. so funny. Youtube chanel: itemish95 is SO funny As is JJP SuperDragon
he is a youtuber and is really funny at making videos about his brother stephan here is his youtube thingy: http://www.wafflepwn.com/ and http://www.youtube.com/user/wafflepwn
Youtube is a great place to find funny video clips. Tumblr a blogging site also has good videos.