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I write very odd things on the back of my discs to ensure a phone call from a person who should happen to come across it. If Dookville sees this thread, he can tell you what's on the back of the disc I traded him, although my guess is he markered over it.
This has worked twice for me. The last time I was at my local course and a guy called me from the course I regularly play. He says, "Is this Josh?", I say yeah, to which he replies, "I found your disc, it says if I don't return it I'll turn gay so I figured I better give you a call.".
2 hours later, we met up and I got my disc.
That phone call was hilarious though, lol.