I remember one where Bert and Ernie are exploring an Egyptian pyramid and the mummy comes to life... that scared me for the longest time. I guess the show has its own Nightmare Fuel page on TV Tropes for a reason[0].
Unfortunately, one episode where Margaret Hamilton reprises her role as the Wicked Witch of the West aired once and was banned after angry letters from parents complaining about how it terrified their kids. I'd like to see that one day.
I'm with you on the mummy one, that scared me too.
It always perplexed me though, why they thought the Count's lightning-thunder-and-bats routine [when he completed a count] was too scary and nixed it -- seemed pretty tame to me -- maybe the noise rattled kids?
Unfortunately, one episode where Margaret Hamilton reprises her role as the Wicked Witch of the West aired once and was banned after angry letters from parents complaining about how it terrified their kids. I'd like to see that one day.
[0]https://tvtropes.org/pmwiki/pmwiki.php/NightmareFuel/SesameS...