Fishhooking

Fishhooking involves sticking a finger into a bodily orifice (like the mouth or nose) and curling the finger to snag the flesh. This is something not represented in GURPS Combat until GURPS Martial Arts 3e did Face Attacks.
GURPS Martial Arts 4e did expand the Face location by adding Nose and Ears and Jaw, but rules focus on the effects of striking them, not grappling.
GURPS Martial Arts: Technical Grappling did on page 7 under Sensitive Locations give some advantage to manipulating the movements of the head by pulling the ear, but not the nose or mouth or eyelid. It's not even clear that "Jaw" necessarily translates into mouth or lip equivalents.
The primary differences is it is possible to hook the flesh of the lip without actually going down the throat because the teeth can stay clamped shut.
Causing pain by pulling on the lips would be one way to force someone to open the jaw/teeth though.
==Friends==
This clip has it mentioned alongside Eye-Gouging
==2005==
August had Peter V. Dell'Orto mention it with disregard
:the usual "I'll stop his grapple by eye gouging/biting/breaking a finger/fishhooking him" is really more theory than practice
Category:Techniques