Yes, at a friends house here in FL. I didnt live here yet, had a spare set of gear at his house........one day there was one left. So technically he lost it, but practically I had to get a new set. 

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YesScuba Brad:Have you EVER lost a fin?
I bought a new pair of the same fins and tossed the odd fin in my misc dive gear box in case I lose one of the new fins.Scuba Brad:And what does one do with ONE fin?
Nope, it was a Reeflex.Scuba Brad:Was it a Tusa open heel?
There is not much to it. Before I switched to jet/rocket/turtle fins and spring straps, I got tangled in a line and in the process of getting free, the compression of my drysuit was enough to allow the rubber strap to slip free and the fin to come off. By the time I was loose, the fin was out of sight.Scuba Brad:Ok now tell me your story
Scuba Brad:...Ok so here is the question: Have you EVER lost a fin? And what does one do with ONE fin? Was it a Tusa open heel?....
Happy Diving