What were moments from NV that make you jump, shriek, etc ;P

I'd say the basemant of REPCONN where all those nightkin jump out at you roaring.
Another would be in REPCONN during Come Fly With Me just getting up from the lobby and there are all those ghouls in the dark, I had Boone with me and even so I just kept spamming RT (Vats) before one could get the drop on me xD

Hunting for skill books. Running to the old nuclear test site( not knowing how many ghouls attention i must have alarmed than turning around and seeing maybe 12+ glowing/reavers chasing me) oh [censored]!