When Cream was a filly, she could never say I love you to anyone, not even her own husband or parents. Even when Pup was born, she still couldn't say I love you so they made their own way of saying I love you to each other. Whenever they want to say 'I love you' they tap their horns together! Pup loves their own little message to each other because others don't know what it means, like a secret handshake!