I think we all know this site and regularly trawl it - mostly for the funny/weird stuff that you often hear about via word of mouth (who really wants to trawl it just to wade through someone's Emo teen angst video diary?).
It's actually pretty easy to find things here - on Saturdays National Radio had a half hour slot where NZ comedians play their favourite comedy clips and you often hear alot of great old classics by people you've never heard of.
One of the ones I remembered was by an American guy (whose name turned out to be Alan Sherman) singing about being a kid and going away to summer camp - it was used in a funny yoghurt ad here about 5 or 6 years back - and I could only recall the first line of the song. Typed it in, and within about 2 hits, found it.
The clip doesn't include visuals, just the audio - for the curious, here's a link to the relevant YouTube page.
Hello Muddah, Hello Father song
And here's another funny cat cartoon (from the same "Simon's Cat" series as the one that did the rounds a few months back).