I can still remember Otto the tail gunner position on a B-25J PKing me from 1.5K out and about 1,000' down with a single hit. Right through the forehead in a 109G6R6 in the WWII arena.
There were many gunners in the game better than Otto (anyone remember MitchH?) but nobody had his magical ability to PK you or rip you in half with the first round.