50+ Email Signature Quotes Funny. A clear conscience is usually the sign of a bad memory. "if opportunity doesn't knock, build a door.". I don't worry about terrorism. It's been swell, but the swelling's gone down. Email signatures don't have to be serious. Approximately 60% include their landline with 28. Well, i've got to get back to work. Sent from outside your window. Why not finish up an email with a funny signature? Many seek good nights and lose good days.