Two flybys come to mind :
About 10 years ago I was in the control tower at RAF Lyneham one sunny Sunday during a families open day chatting with the ATC folks. We heard "N-something or other, P51 routing from such-and-such a display to such-and-such a display request transit through your zone". ATC cleared the Mustang directly over Lyneham low level and told me to climb up to the top of the tower. The Mustang approached Lyneham below the top of the tower at very high speed and performed a victory roll as he passed by the tower.
On another occasion at a display RAF Fairford a couple of Luftwaffe Starfighters dove down the runway line with afterburners lit. I said to Pat "Jeez, they're moving" just before a very very loud bang set car alarms off, had children crying, <img src="smile.gif" border="0">
[ 08 January 2002: Message edited by: PPRuNe Dispatcher ]</p>