Hmm, you can also try to pretend you have one on yourself and laugh joker-style looking up then talking to the ceiling, making sure the volume of your voice was

Hmm, you can also try to pretend you have one on yourself and laugh joker-style looking up then talking to the ceiling, making sure the volume of your voice was uncomfortably loud and inappropriate for the setting you are in. Its not like that person can call you rude and it will give you some satisfaction that you have interrupted their call. Maybe they will self reflect at some point realizing how rude they are themselves. IDK.