[RogerBW]

Frequent fright checks will eventually make a character unplayable, and taking this disadvantage is asking for fright checks after one of the more common sorts of PC activity. A lot of people will be twitchy and useless for a bit after an exciting situation (adrenalin/epinephrine leaves lots of interesting chemicals washing around the bloodstream, producing effects which one can learn to overcome), and it would be good to be able to emulate that in GURPS, but this is a much bigger version.

It's unfortunate that the peaked probability curve of 3d6 means that "gain a new quirk" shows up way more often than one might like it to (most fright checks are only failed by a point or two in the games I've played).