Not sure whether this is "wry humour"
Obviously you didn't see it
For the benefit of yourself and those not there - the smoke from the wingtips broke at points to joint together in rings. I've never seen it before. I had some photos, but they're in boxes in the garage - there was also discussion about it in the AOPA mag at the time (check your back issues) with a drawing describing it.
If you would like to post the part of aerodynamics 101 that explains how it happened, I eagerly await your reply.
(ps - they were not regular wing tip vortices if that's what you're alluding to)
Ok - here\'s photos to explain what I meant
Over time the left and right smoke joined together in to rings. The photos I found on the web don\'t do justice to how cool it looked however.
This is a Sea Fury in the US - but how COOL does this look?
More
here (scroll down a bit)