My best of those I converted was a youngster who was going to use a spinning rod [warm water fishing in a river in South Africa] and I said to him that with me it's only with the fly or he could'nt fish with us, he gave me a startled look then said ok.
I ran him through the basics had him throwing a fair line in about 15 minutes and within a half hour he was into his first fish a nice 2 pounder.