You've just made a store run, and you need to refill your pantry, but you're hungry.  So, you decide to pop a bag of popcorn that you already had sitting in the kitchen.  You set the popcorn to pop, and wait for it to finish.  After your meal, you can now refill that pantry.  After the popcorn, you find that the work has flown by.  So, What do you say, let's pop some popcorn, and refill that pantry?