It's rude to to be anti-social.
Eric, a new employee, sits alone in the lunch room, unsure of how to approach anyone or who he should talk to.
Eric wants to meet someone to talk to at work.
Eric decides to take a chance, and he makes eye contact and sociable gestures toward a crowded table of his new coworkers.
Eric is paralyzed by uncertainty and doesn't make eye contact with anyone, or start any conversations.
One of the people sitting at the crowded table feels encouraged and comes over to introduce themselves, initiating Eric into the office social network.
The other people in the lunchroom are unsure how to approach Eric, who doesn't look very friendly, and Eric feels isolated.