Etiquette

When talking with someone on the phone or chatting with someone via one of the messenger services, or even when actually in someone’s company in the flesh, what’s the proper way to tell someone that he or she is boring the living flying fuck out of you? Is it rude to just start snoring? Or pretend someone is knocking at the door — even if you’re standing on a street corner? Or to tell the soporific drone that you think you hear your mother calling you, even though she’s been dead for a decade?
Just wondering.