Who would have thought that POP servers have a sense of humour? But here is a transcript of a telnet session with the Cambridge University mail server:
+OK POP3 yellow.csi.cam.ac.uk v2000.70 server ready USER jchl2 +OK User name accepted, password please PASS ******* +OK Mailbox open, 1 messages NOOP +OK No-op to you too! QUIT +OK Sayonara
Fabulous!