I work as a commis chef in a pub and i assure you all, people in pubs dont actually really talk about anything much. Yeh they do a lot of talking but they talk about nothing. Oh, and intellect? doesnt take a genius to see you dont find this in a pub. Alcohol quite clearly kills more braincells than any other drug, bar mdma.
Stoners talk about interesting things because they actually think before they talk.