Dear {name},

Hello old chum :) Its me the fish! I am writing to wish you a very happy birthday, I know sometimes life out of the water can be very dry! Ohohoh (I am a funny fish!)

Me and my wife (Mrs Fish) are very happy here under the sea, Uncle starfish visited last week and we swashbuckled!

Enjoy being 18! You you'll wake up tormorrow and it'll be like 10 years have passed, ohohohoh

A selfie!

Your good friend, The Fish :)