someone joked that their hobby is to kill time, so i joked they must go to bars a lot then, and i was correct.

arguably, going to a bar, especially if it's the same group of people every time, is a kind of hobby. like Cheers the TV show.

some people do that without the alcohol. dad is retired and he likes to just sit at a table they put out at the local shopping centre and wait for people he knows to pass by to strike up a conversation. he has enough acquaintances that there's a pretty good chance that someone he knows is going to pass through there.