well now that we've all seen it about 50 times i can only say it gets funnier each time. i remember watching it the first time and thinking how could anyone think this is funny...well, now i'm a believer.
and i've actually looked the whole episode with Noel Fielding's other character. i didn't even realize before but he plays old gregg as well
i also suggest other episodes of the mighty boosh. Fountain of Youth is a good one but i'm not allowed to embed it, hit up youtube