Fallout has the capability to make you shit yourself on a regular basis and i'd like to know the scariest experience you've had. Mine was when a supermutant literally turned inside out and scared the shit out of me. How about you folks.

Lets see there are several:

Being chased by giant tarantula's in NV by using Monster Mod.
Being chased by 2 xenomorph's then followed by a Werewolf, also by using Monster Mod.

I nope the hell away from them and often try to climb the first billboard I find (accessabel by a mod)

When the Death claw alpha male followed me from the quarry to Sloan and kill everyone.