Here's another unfortunate accident (S-61 being flown by a friend and former colleague)
http://www.aaib.gov.uk/cms_resources...3%20G-BPJT.pdf
I once encountered the wake of an AS332 while landing in a Warrior. We rolled to about 60 degrees at 50 ft, and I think the two things that saved us were my previous aerobatic training and that the engine didn't 'rich-cut' as I slammed the throttle open!