Remember watching an Aurigny Trislander as SOU once. The pilot was rather chubby to say the least. On his walkround he reached up and grabbed the wingtip with both hands and violently rocked the entire aircraft for about 20 seconds.
An ex-BA 747 skipper who was offered a job with Aurigny also saw this at SOU at a different time. He did not take the job - thought the Trislander looked a bit "flimsy" after his 747!