I just joined a big IT firm and most of my colleagues used to work there from 6-7 years. They already have chemistry within them. Any newbie joining had to follow them everywhere from lunch to tea breaks. My boss was one of them.
Being an introvert it became too much for me and also being with my boss all the time was little uncomfortable.So after skipping lunches few times my coworkers started taunting me for not joining them.