Life is chaotic, there's work, shopping, laundry, cooking, cleaning and bills to pay. Sometimes parents are so busy with the daily stuff of life that they forget to just put everything aside for a few minutes and enjoy being with their kids.
You don't have to go anywhere and you don't have to spend any money. You can play a board game, bake some cookies, dance to a silly song, snuggle on the sofa or rough house. The activity itself doesn't matter. The fact that you're doing something spontaneous with your kids is what's really important.
When was the last time you enjoyed being with your kids and what did it include?