Yeah, it's the simlish version of some jerk standing behind you while you exercise at the gym, saying "Want to know what you're doing wrong? I can tell you..."
*roffles* That's pretty much it, on the nose.
So far I've seen a nature sim sidle up to someone fishing to chat away about... I dunno, lures or something... and some science sims who'll wander over to whoever's using the telescope, presumably to suggest they might enjoy looking for stars. I haven't really noticed it with other hobbies yet, though.