"The scriptures say all have sinned and all fall short of the glory of God." Then looking out among the congregation he aske, rhetorically, "is there anyone here who has never sinned? Anyone who has lived a perfect life?" If so stand up!
To the preacher's surprise, an elderly man in the back stood up.
"Do you mean to tell this congregation that you have never sinned--that you are perfect?" asked the stunned preacher.
"No," said the elderly man, "I'm standing by proxy for my late wife."