What frightening experiences have you had when flying and what lessons have you learned from them?
Frightening Experience - Bangkok Suvarnabumi fog.
Lessons Learned - Take plenty of gas!
F.E. - Bangkok Suvarnabumi with ATC radar failure
L.L. - Divert!
F.E. - Bangkok ATC (anywhere)
L.L. - Look at the TCAS first!
F.E. - Runaway prop in a bloodey Aztec!

L.L. - An Aztec dragging its @rse on one METO'd donk can fly very well near the stall
F.E. - E/failure on a clapped-out 737-200 at MTOW
L.L. - Have nothing to do with clapped-out 737-200s
F.E. - Navajo with elevater cable stuck after TO.
L.L. - Leave the gear down and play with the flaps. Trim is useless.
And at the VERY top of the heap -
Frightening Experience(s) - 200hr wonderkids in RHS of 737-800s and A320s
Lessons (the kids) Learned - Dont fly with me until they have 1500 hours, or get a few hundred hours charter in poorly-maintained non-turbo Navajos or Aztecs with leakey props!