Since I sometimes play at work (I know, I'm bad) I have to keep the volume off and I can't use headphones so I can hear if someone starts talking to me. This means I've missed the Rube a few times because he moves so slowly and the only indication he's there is the change in music - and the local chat, but that gets spammed with so many messages I don't pay much attention to it. Maybe a pop-up box like the one we get when there's a delivery, shown only to the player the Rube is there for?