Busted

Right, so while walking to the library earlier today, I saw to high school aged looking boys. Nothing suspicious about that, right? Except that it was around 2 in the afternoon. I remember thinking 'huh... Shouldn't they be in school about now?' but I didn't say anything, just kept on walking home. Before I got home though, my mom met me and asked if I wanted to walk to seven-eleven with her. Me being me, I said sure. So while we are walking up the street I see the same boys from earlier walking back with a police car slowly cruising behind them.  So when we get within talking distance my mom asks 'whatja do?' they both kept watching their feet, but one got this big Cheshire Cat grin on his face and replied 'Got caught'.  It was actually really funny, but you would have to be there to have heard the slyness in his voice when he said it.  The police man then asks us if we should be in school.  I should get four cookies for not laughing right there.  My mom bent over so she could speak to him and said 'I'm thirty six years old, and my daughter is home schooled. I don't think we need to be at the high school.'. Man his face couldn't have turned any redder. He was so embarrassed!! Ciao!!!
Why is a raven like a writing desk?