Start with the B-727 vortices. When I jogged under final approach at MSP several years ago, the descending wingtip vorteces from a 727 sounded like a pair of the weirdest whistling dust devils I could imagine, especially when they hit the trees.
A Lufthansa pilot told me years ago in SFO (as we waited for our limo vans) that his A-340 was quickly rolled to about 20-25 degrees when he departed Munich behind a 757.
