I had a similar experience tying a new cab about a month ago. I took my head and main bass into the shop which I always do if i'm serious about new gear. The bass sales guy says "nice Alembic", which its not. So i say "actually its a JayDee". Same stunned silence as discribed by the OP. I realize that he thinks he's just made an ass of himself. So I just carry on and try and let him down gently by saying that they do look remarkably simlar, and it is definatly not the first time people have asked about my "Alembic". he lightened up and we moved on. Bought the cab.