Related:

• Who teach- don't know. Who know- don't teach.
• Knock knock Who's there? Don Juan Don Juan who? I Don Juan to set the world on fire!
• Oh, no! Don Ho!
• Bob, Don and Joe were lifelong friends. Suddenly one day Joe disappeared.
  Everybody was helping Bob and Don find Joe, until Bob and Don remembered that Joe had two assholes....
• There was a young fellow named Tucker Who, instructing a novice cock-sucker, Said, "Don`t bow out your lips Like an elephant's hips, The boys like it best when they pucker.
• Is Don Adams mad? (A nod.) Si!
• Ashes and keyb ards don mix!
• I'm *not* paranoid! (Who wants to know?)
• The ill-tempered cannot teach. Hillel