Ah I see, well I was in the demographic sweet spot for the show growing up, so maybe that's why I found the clip so funny.
Basically if you were caught by a Temple Guard in the final challenge, you lost. The only way to avoid them was to give them a medallion, of which you earned throughout challenges earlier in the show. The Temple Guards were always jumping out of really predictable places, and the kids were usually quick with the medallions so they could continue on with the challenge.
Music lovers of all genres - not just classical - will appreciate this. (Although, as a kid who grew up playing baroque fugues while the other kids were playing video games, this one is particularly funny to me!)
02/08 Tool 02/11 Jeff Mangum 02/17 of Montreal 02/29 Blind Pilot 03/31 The Naked & The Famous 05/14 M83 and I Break Horses 05/19 Flaming Lips, Young the Giant, Dawes and AWOLNATION 06/07 Bonnaroo 2012!!! 06/13 Roger Waters 07/28 Toadies