how about:
"we return all submissions, unread, with the same old photocopied reply slip saying we're not taking on new clients"
"Only apply if you're a close friend, or family of a friend, or if we've met you at a party"
"Don't send anything original as we're only looking for clones of established writers that belong to other agents"
"We read everything and give praise, comments and criticism - please include fee"
Colin M