My students quickly learn not to expect a straight answer to any question they might ask:
Student: Can you help me?
Mr. E: I'm not a psychiatrist, but I'll do my best!
Student: Can I go to the bathroom?
Mr. E: I don't know ... can you?
Student: May I go to the bathroom?
Mr. E: Not in here!!
Mr. E: Be patient!
Student: I have no patience!
Mr. E: Remember ... without patients you'll never be a doctor!
Student: I was just kidding!
Mr. E: Keep on kidding and you'll have a whole family of small goats!
Student: You're getting on my nerves!
Mr. E: Well don't leave them laying around!
By the end of the school year, they even use these jokes on me!!