I don't have to say more, quests with screeching falmers, especially when accompanied by chaurus creeps, I hate the flying version. In groups they tend to gang you up and rip you apart. The start of "Liar's retreat" on higher levels will put you up to a bunch of those, including warmongers and shadowmasters.
I don't know about any certain quest. But I find it scary to play with lights off, Brightness down, and sound up, Music off. and if on PC some lighting and sound mods. This makes caves and ruins very dark and scary. One of the Falmer caves who's name slips my mind right now. Has a huge room with some Giant Frostbite Spiders in it. Once the first one fell on my head I freaked out ran out of the cave and haven't been back since. Having Arachnophobia helps in that situation.
Quoting Skyrim Wiki, Jasper
"A single hostile Orc bandit is hiding from the falmer, barricaded in a sleeping area behind a locked door. There are also frostbite spiders, (one of which drops from a hole in the ceiling) and chaurus, (including a chaurus reaper), deeper inside the cave system."