Set-up:
Lang Lang: "But Barnabas Barnabas, as a man of science, I would find it objectionable to state that I am a little teacup when I am not! I'm also not short nor am I stout!"
Barnabas: "Well Doctor, if I had a yardstick on me... never mind. Even I possess more of a sense of the whimsical than you. I'll bet you've never even _________!!"