This is the perfect place to share an anecdote that happened to me two or so weeks ago. I draw the same pinwheel design on the bottom of all my discs, to go along with my name/cell# and as of recently, my email address. I was playing by myself up at Black Mouse and a pair of guys let me throw through. I pulled out a disc, and went through my release a few times before throwing. Behind me, they lean in close to each other and talk under their breath, shaking their heads. This gives me pause. I throw, and very nearly park it. Then, one rolls his eyes and they start laughing, which made no sense given my throw. He says, "So, we saw your disc and..." He reaches into his bag and pulls out a disc I lost a few weeks back, "...is this your disc, bro?" Makes all that sharpie work worth it. (I suppose it's also relevant that he hadn't called me when he found it.)