1. Flying at night with night vision goggles once in another country. Crossed a ridge line and came face to face with a B-52 flying low level in the other direction.
2. Taking off from PFN early in the morning before tower opened with 66 PAX. I think it was 1/4 mile. Called for and got clearance from JAX center; then took the active after announcing intention to depart to the north. Just as we're about to push the power forward, we hear "Aircraft departing northbound at PFN, this is Lear 1234, on the take off roll to the south, shouldn't be a factor." FO and I look at each other with the "Did we really just hear that?" Just then the Lear goes right over us in the other direction. A minute later while I'm cleaning out my drawers, he checks in with center looking for his IFR clearance.
3. 11,000, IMC. Center tells me I have VFR traffic, 12 o'clock, 10,500, closing. "Huh?" Just then I get "CLIMB, CLIMB, CLIMB" from TCAS. Not sure how close I got (again, I was IMC), but sure got my attention.