I've ignored a coworker on more than one occasion during lunch since I'm reading, and he doesn't understand that when I'm reading I don't want to be disturbed. He'll be reading some news on his phone, make a grunting sound or shift positions, hoping someone will look at him, where the eye contact will be made. Once the eyes meet, he tells them about some news article he just read, and will then proceed to tell them each and every one he reads.
Not really that tiresome, but I rely on my lunch to recharge a little bit, and I can't do that if he's constantly telling me about random stuff. So I don't let him set up that line of communication in the first place, where I just normally listen to music, and I'm left in peace.