A question of March 20, 1999 from a Time lesson student:

1. Isn't "Have you run into an old friend unexpectedly?" redundant if it means to meet someone by chance? I mean, is it possible to run into an old friend expectantly? Sorry. This is my bad joke.

Yes, it is redundant. You caught me asleep at the wheel! I think we would say "Have you ever met a friend unexpectedly?" in this situation.