If the FAA flew it , it was a prerequisite to be ugly...
I think they have the MoU within the aircraft certification department of the FAA. The Ministry of Ugly (MoU) is staffed by a John Cleese-looking character who demands, on presentation of the plans for a new plane, "Right then, is it ugly..." and proceeds to add bumps, bulges, assymetric fairings, odd angles, extra strakes and complex operating features if not already incorporated.
I think he was on holiday when the Seafire was presented, though.
Mongo