Pie to the face?
by mshrm
Players were asking about different improvised weapons, and the question came up: what about a pie to the face?
I don’t know if there’s an official answer, though I doubt it. I’m sure I would have heard if GURPS Clown College were a real thing. So here’s my take on it.
First, the would-be pie attacker needs to Ready the pie. This can get tricky. Nobody makes pie holsters. Concealing a cream pie seem difficult; Holdout modifiers would start based on the size of the pie, with modifiers based on the chosen scheme – likely penalties. It’s unlikely that many characters would have points in Fast-Draw (Pie). So, there are challenges there.
Once Readied, the attacker would need to approach to Close Combat range. When wielded in the traditional pie-to-the-face way, there’s clearly no extra reach on a cream pie.
Finally, the attack would need to make an attack roll. I’m inclined to go with Brawling or DX, just like a punch, taking the -5 for Face.
Once all that comes together, I would have the victim make a Will roll or suffer Mental Stun. The roll might be modified according to the victim’s traits. If they had some sort of fear of public humiliation, say, that would be a penalty.
Don't Forget Your Boots 
I accepted your answer without question.
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Those are all very “realism” oriented answers. but, Pie To The Face is very trope, and the trope is: someone is hit in the face with the pie, whether that is the target, the attacker, of an innocent adjacent victim (or in some cases a very important someone who is off-screen when the pie throw goes very awry).
Also in the trope, pies can be thrown short (or in high Toonish genres, very long) distances.
So, based on that the Tropeish rules is that the Pie is both a Reach c as well as Range: ST weapon (for very high Toonism, Half Dam is ST with no upper range limit – the pie will hit someone/thing!). There is no penalty to-hit, however should the defender Dodge (or the attacker miss), the pie travels in a straight line and has a chance to hit the next target, using the same to-hit chance! If the defender Parries it is deflected in a random direction to hit someone else, if they Block it splatters against the blocking object.
Should the attacker critically miss or a defender critically defend, the pie hits the attacker in the face automagically. In fact, even in high realism rules, this last rule should be in effect.
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