I flew with Jack Frost when doing an IRI course at VL. Intensely irritating with a habit of pointing out the blindingly obvious, such as, "Do you realise you're 100' low?" He did however let me loose in the GA11 between IR ordeals.
Mike Vickers did me on a trappers visit in the late 60's in Bahrein. He was in the company of Colin Holman, another real gent.
My own candidate for sh*t of the century, (20th that is), was my personal instructor at Syerston, Jim Hawkins. First tour A1, but what a hard nut. Made me run back from the end of the runway after one particularly gruelling circuit-bashing session. Had many a student in tears and was not averse to physical violence. He got his wish and was posted to 20 in Tengah, but hated every minute. Eventually became a TP for BAe.