most frightening WAD you've played?

[Leon]

I'm looking for a WAD that makes you jump!!

[Ribbiks]

I suggest Unloved or Happy Time Circus II, they've got some good creepy ambiance goin on

[K3K]

Happy time circus 1 and 2. Don't forget the Ghoul's Forest series (No not the crappy 3D remake Ghoul 3D :P

[Marnetmar]

Unloved and Asylum of the Wretched are pretty spooky. HTC is pretty mediocre, IMO.