You know, Mexicub, I was rather taken aback by your comment on magicians doing something fishy, because it's exactly what I was thinking when you were talking about doing a DL in an odd sort of way (because you're a magician and, well, that's just how magicians do it).
So why would you turn over a card like an average Joe when youre not an average Joe?
Why? Because any other way is a "tell." That's the "fishy" thing that you're talking about. When a spectator observes you do something that just ain't right, they might not know what you did, but they know that something's up.
I find it rather comical that you can identify this "fishy" thing in someone else's material, but just don't see it in your own.
So, when you flip your double "because that's just the way that a magician does it" then you are telling your spectators that you're doing something that ain't quite right. They can't see what you did but they certainly know that you did something fishy - the magic is lost.
Mike.