A teenager was sitting in church, and when the collection plate was passed around, he quickly pulled a dollar bill from his pocket and dropped it in. Just then, the person behind him tapped him on his shoulder and handed him a $20 bill. The boy smiled, placed the $20 in the plate and passed it on, admiring that the man was being generous. Then the boy felt another tap from behind and heard a whisper:
"Son," the man said, "that was your $20 bill that had fallen out of your pocket."
From Christianstories.com