The detective with the flat, droopy walrus moustache is Thompson and introduces himself as " Thompson, with a'P', as in psychology ", " Philadelphia ", or any other " P " word in which the initial " P " is combined with another letter, losing the initial " P " sound or else rendering it completely silent, while the detective with the flared, pointy moustache is Thomson, who often introduces himself as " Thomson, without a'P', as in Venezuela ."
