The man in the gabardine suit is a spy.
The man in the gabardine suit is a horse.
The man in the gabardine suit is a chicken.
This should cover all bases.
Or, the horse in the gabardine suit is spying on the chicken. His bow tie is really a camera.
The fat man sits on the roof.
The pigeon sings by the river.
Code and response for a conversation containing secret info.
It only works with certain people, though. ;o]