How it happened was that we went to Swimming with Turtles in Sato'alepai Village, Savai'i, Samoa. You basically hop into this large lagoon pool where there are a bunch of pretty chilled out turtles, doing their own thing and waiting for someone to swim by with a tasty piece of papaya. Which they are happy to take from your hands, as shown in this video shot by our sailing friend Leanne from True Blue V.
Unfortunately I think that there is a simple flaw in the premise of getting turtles used to snacking on papaya. Papaya isn't that dissimilar in colour and shape to a human butt.
You can guess the rest of the thought process going on in that tiny little turtle brain all by yourselves.