[LeifCarrotson]

I'm not sure about the 20 points number, the effect feels much larger. Perhaps if you simultaneously apply a 20% penalty to hand-eye coordination, balance, facial expressions, typing skills, enunciation, penmanship, memory/recall, creativity, etc. you could accurately represent my skill as a human being while presenting.

[kpil]

It's a truth universally acknowledged, that a man in possession of a keyboard is guaranteed to spot spelling errors and trivial errors absolutely last of everyone watching.