My mother asked me run an errand at the local shop. When the shop keeper gave me the change I said to him, "Where's the rest of my change?"
"What do you mean?"
"I gave you £10 but you've given me change for a fiver," I said.
The man opened his till and gave me a five Pound note. "Sorry about that!"
When I went home and gave my mother her change she said, "Why are you giving me the £5 note?"
"It's your change."
"But I only gave you £5," she said.
"Are you sure you didn't give me a tenner?"
"No, I gave you £5."
"I was so convinced you gave me a tenner I convinced that poor shop keeper to give me the £5."
"Well, could you return his money?"
When I returned the shop keeper's £5 he said, "I was sure you'd given me £5."
That's the power of conviction, even when you're way off the mark, you can convince people to believe in you.
Related articles: Mind Control; Belief versus Knowing