Random headcanon of the day:
Phantom Limb casually flipping people off with a pleasant smile or very even-tempered look on his face in the middle of what sounds like very reasonable conversation on a regular basis.
Phantom Limb trying to offer his hand for a handshake and getting increasingly annoyed as the other party keeps grabbing air or too far up his arm, to the point where he just says “fuck it” and kills the guy.
Phantom Limb gesticulating while speaking to try and emphasize what he is saying and people not understanding him because no one can see his gestures.