Three examples of crosstalk that doesn't involve wires and electric signals are?

any form of communication that could be mis-understood or become entangled 1) smoke signals - two people making smoke signals on the same hill top, talking to different people, it would be hard to make out which conversation the signal is for. 2) Drums - two people playing signal drums in the same location, but talking to different people. 3) Morse Code lamps - ships used to comunicate using flashes from lamps, you could see a message that not for you and respond to it 4) Talking to a person in a crowd and you hear other conversations in the background.