During lunchtime, you notice that your lunchbox is missing from the cafeteria. You're hungry, and you can't find it anywhere.
You finish your math homework and put it in your backpack, but when you get to school the next day, it's not there. You have math class in an hour, and you need your homework to turn in.
Your class has a pet hamster, you decide to take the hamster out and play with it. You put it back in the cage. 10 min later your friend notices the cage open and hamster missing!