I was reminded of this story today when I saw a little girl with candy in the checkout line at the grocery store.
I was a (mostly) good girl when I was little.  I tried to do what I was supposed to, rarely lied and never stole.  One day my mom and I were at Tom Thumb, and I saw these in the checkout lane:

And I just had to have them!  So I asked my mom, and she said no.  In addition to being a (mostly) good girl, I was also a very smart little girl.  I knew it was wrong to steal, so when my mom wasn't looking, I got a packet of Chiclets and stuck it under the rest of our food on the conveyor belt.
I thought I was home free when the cashier scanned them and put them in the bag without my mom noticing.  We got home and I managed to sneak them into my room... yes!  I was going to be able to eat my Chiclets later that  night.
Unfortunately, I didn't realize that my mom was in the habit of double-checking her receipts once we got home to make sure that everything rang up at the right price...  Busted!
(But not before I ate them.)