For me it’s the Boscombe Down air show/families day on 83 or 83. ETPS T5 Lightning did a display and I remember standing on the Apron with beacon hill to my left. Lots of noise and turning then for the final high speed run (clear blue day), it came from the beacon hill direction quite low with the halo just aft of the cockpit and then zoom climbed until you could see it no more.
Strange how some things stick with you.