None, I've jumped at the chance for anything that might be considered by some (and not by others) as "out of the ordinary". The more interesting ones as pax have included:
VC10, Herc, Chinook, Wessex, Andover, IL18, S61N, Gulfstream 5,
Tu134, Trislander, Trident, 707, 1-11, 727, F27, TriStar (last 6 mentioned, as either rare or gone forever these days).
Actually, bugger, there is one....Concorde. Really wish I'd done it now.