When I was in, let's see, probably about fifth grade, I decided that I was going to keep a kitten. Secretly.
I had a plan.
The plan was to accept one of the kittens that a classmate was giving away,and to put it in my lunchbox and take it home with my carpool. Then, once I got it home, I was going to keep it in my (rather large) toybox while I was away at school, and then let it out to frolic when I came home. Needless to say, this plan did not work.
Guess where it stopped working?
Yep. Right about when I tried to convince my classmate that, yes, my mom said I could have a kitten, and could I just put it in my lunchbox? He didn't fall for it. I have my doubts as to his regard to my character ever since.
Just a little anecdote for you. It's not a metaphor or anything like that.