Yes. There was a guy friend who declared his undying love for me several years ago, but I didn't feel the same way so I let him down gently. Unfortunately, he saw the fact that I hadn't given him a cruel, humiliating rejection as a "maybe" and started pestering me (flowers, presents, very badly written love letters, etc) which went on for a few months. Eventually, he got the message, though, and for the past few years we've been back to being good friends.