Interpersonal communication is complicated
Osmo Wiio gives us some communication maxims similar to Murphy's law (Osmo Wiio, Wiio's Laws--and Some Others (Espoo, Finland: Welin-Goos, 1978):
↔ If communication can fail, it will.
↔ If a message can be understood in different ways, it will be understood in just that way which does the most harm.
↔ There is always somebody who knows better than you what you meant by your message.
↔ The more communication there is, the more difficult it is for communication to succeed.