Miracles

At Bible study this week we were talking about how sometimes bad things happen to good people (accidents, illness, natural disasters...) and it's not because God wanted to punish them for something.  On the other hand, if we're not crediting God with tragedy, what about miracles?  Are they just great, sometimes unbelievable things that happen, or is a miracle God at work?  Have you ever experienced a miracle?  Anything lately?