What did he just say?

"Wait, what?" I said "you're the duplicate, I'm the real Jon." "No you're not," he argued "you were created by the wish." "You were!" I snapped back, "I wished for two heads and then you appeared." "You've got it backwards," he snorted, "I distinctly remember making the wish and then you appeared." "But-" I started to protest but was distracted by Karyn's laughter. "Don't you get it numbskulls," she giggled, "You're both the real Jon. You made the wish and got split in two."