In this clip Christian mentions the Harold Beatbox segment from season 1 and suggests the similarities between it and the YOP commercial that came out a little while after. It's funny he mentions it because the Harold clip was actually inspired by this clip that I'm sure a LOT of you know about:
When the script called for Harold to beatbox, Brian Froud did an amazing job as always with Harold's voice. I really loved the Lasse Gjertsen clip. So I sat up into the wee hours cutting together samples of the lines Brian did and made that track using the software Audacity. So now you know.
I was always really happy with the way it turned out.