About 20 years ago had two memorable experiences.
1st was given a clearance to transit Avalon coastal in an archer at (I think - might have been 2500) and given traffic as a 747 doing circuits at 1500'. Passing the upwind end of the runway, had the 74 climbing directly towards me - awesome sight as it turned away for crosswind seemingly only a mile or so away.
2nd was in the same aircraft, Moorabbin to Echucha in a howling northerly at 6000'. Traffic advised as a 747 1000' below right to left. Sure enough a united 747 on base for Tulla passed directly underneath with what looked like a 20 degree crab.
Doesn't seem to happen so much any more.
UTR