The lawyer went to great lengths to impress upon the witness the necessity of telling the exact truth, then asked:
"Do you drive a wagon?"
"No, sir," the witness replied.
"What!" exclaimed the lawyer, "didn't you just tell my colleague that you did?"
"No, I didn't, sir," was the meek response.
"Look," stormed the lawyer, "I'm putting it to you on your oath: do you drive a wagon? "
"No, sir," was the firm reply. "I drive a horse. Wagon's are really hard to drive by themselves ..."