When I was doing my private I had a near miss on a taxiway once.
I was facing across the taxiway doing a run-up in a C152 with my instructor in the right seat. A Diamond DA20 taxied up and turned into the wind next to us to do his run-up which he must have rushed because he finished before us and turned to pass us on the taxiway, only problem was his wingtip was going to go through our propeller as he passed. My mind was trying to translate "WATCH OUT!" into proper radio speak to transmit on ground as I reached to turn off the mags (funny how hard it is to come up with "CGXXX this is CFYYY watch your wingtip please!" under pressure) . My instructor asked what I was doing when the engine stopped and I nodded to the Katana which was about to hit our cowl with his wingtip. He hit transmit switch and yelled "WATCH OUT!" and the Katana jerked to a stop with a foot or two to spare.
- You don't always have to use proper radio speak when speed is of the essence.
- Situational awareness is a good thing to have even when you aren't in the air.
- Always watch your wingtips when taxiing.
Years later I still wonder what the sound of a metal prop turning a composite wingtip to confetti would be.