The first time I was terrified in an aircraft , I had about 100 hours in an airplane , and dropped of a passenger about 30 miles from my home airport , They got out , closed the door and I taxied out... I didnt even shut off the engine ... As soon as I started climbing out the plane started making a horrendous and loud banging noise , which got progressively louder ....THe only thing I knew for sure was that the plane was still climbing , AS I tuned the radio to call out an emergency at the airport in front of me I noticed the seat belt was hanging out of the door ... What a relief!!!! The second Time I was with a CFI checking out in a Musketeer I purchased , The plane lost power on takeoff and was barely holding altitude about 30 feet above the trees , The CFI went to grab the Mag switch , and I grabbed his hand and put it in his lap and said emphatically " Its making power leave it the fuck alone " We made it around and landed without incident , The throttle cable sheath had slid in the single clamp that holds it to the mount... ( this plane now has about 4 clamps holding the sheath to the mount now) Had we touched anything , we would have not made it over the treetops , I think in that moment of terror I had exceptional clarity on what to (or not to) do.. I think the moral of the story is Don't second guess yourself!!!!