Two years after having a baby, you discover that, through a hospital error, you were given the wrong child. What would you do?

When I turned ten, my parents asked me to the living room for a family meeting.  I thought they had found out it was me who covered the boy's room ceiling at school with hundreds of wet wads of paper towels.  Thrown forcefully underhand, they stick with a satisfying "thwack" and surprising longevity.  "Longevity" is a word I inadvertently learned from my Word a Day calendar.  So was "inadvertently".  I didn't want to learn, but junk like that sticks to my grey matter.

Luckily, I knew not to confess without listening first.  Good news: they didn't know about my escapade (March 5th Word of the Day.)  Bad news: they weren't really my parents.