Thing 1, on finding a key in the street.  "What if this was a golden key.  Do you think this is actually gold?  Never mind - don't tell me.  Anyway, what if this golden key unlocked a secret room.  But it would probably take forever to find.  So I'd get old and pass it to my kid, then they'd get old and pass it to theirs and finally - they'd open the lock.  Inside would be one beautiful penny."

Long pause.

"You know - it would be way easier to just go into your parents room and find a penny."