Blake's 7 (Which is a bit obscure, but less so for a British con and besides canon has the best combination of epic Shakespearean tragedgy and snark combined with the most ridiculous SFX and gloriously OTT costuming, so.) Fashion is Danger: https://www.youtube.com/watch?v=kmqVreKouzM B7 do the Hokey Cokey: https://www.youtube.com/watch?v=33uIsUBtdto (The vidder has a few others, including Right Said Fred and Benny Hill's tale of Ernie the Milkman, but I suspect these recs are two too many already)
And from possibly obscure to off the scale, but don't ask me why, this is v funny: BBC 1979 Julius Caesar to Lady Gaga's Poker Face: https://youtu.be/9cop8vfFMcU (I think it's Richard Pasco's face, probably. The eyebrow lift. Or I'm just very odd, always an option)
ETA: This came up in the B7 links and I'd forgotten it and it may be the funniest. Or the most disturbing: https://www.youtube.com/watch?v=y22_bSqwPPw (Contains one brief spoiler, although when I say spoiler, I mean, spoilery thing that 40 yr old cult show is most famousest for, so, you know.)
Passing by with some more recs
Star Trek
TOS/Monty Python mash-up: https://www.youtube.com/watch?v=luVjkTEIoJc (I'm not sure, I think this may still officially be funniest vid ever.)
Voyager does The Internet Is For Porn: https://www.youtube.com/watch?v=thQEEZuponw
Doctor Who
Babelcolour's 5678: https://www.youtube.com/watch?v=bdENjiUW66w
Fifth Doctor Era partying in Last Friday Night: https://www.youtube.com/watch?v=mLAn2QfDCfE
(Given all you've got, you probably won't want one tiny era of OLd Who, but I've seen a bunch of these, and this is the best. I think it's probably Turlough).
Blake's 7
(Which is a bit obscure, but less so for a British con and besides canon has the best combination of epic Shakespearean tragedgy and snark combined with the most ridiculous SFX and gloriously OTT costuming, so.)
Fashion is Danger: https://www.youtube.com/watch?v=kmqVreKouzM
B7 do the Hokey Cokey: https://www.youtube.com/watch?v=33uIsUBtdto (The vidder has a few others, including Right Said Fred and Benny Hill's tale of Ernie the Milkman, but I suspect these recs are two too many already)
And from possibly obscure to off the scale, but don't ask me why, this is v funny:
BBC 1979 Julius Caesar to Lady Gaga's Poker Face: https://youtu.be/9cop8vfFMcU
(I think it's Richard Pasco's face, probably. The eyebrow lift. Or I'm just very odd, always an option)
The West Wing
High School Never Ends: https://vimeo.com/19567826
ETA: This came up in the B7 links and I'd forgotten it and it may be the funniest. Or the most disturbing: https://www.youtube.com/watch?v=y22_bSqwPPw
(Contains one brief spoiler, although when I say spoiler, I mean, spoilery thing that 40 yr old cult show is most famousest for, so, you know.)