This American Life has a story I found pretty interesting:
The Devil Wears Birkenstocks.
Some people battle inner demons, but contributor Dave Dickerson went one step further. Dave tells the story of the time he took on an actual demon in his college classroom. (10 and 1/2 minutes).
(The full hour podcast is here, available for free.)
The stuff the the story about missionaries encountering real demons and miracles is stuff I heard growing up, too. I can’t recall any specific details about who exactly these missionaries were, and I don’t remember any missionaries actually claiming it happened directly to them. The vagueness made these stories a bit like urban legends – impossible to verify, and no one actually claimed first-hand experience. (Admittedly, there are some people who claim first-hand experience, but some of them have been proven to be liars.)