He was in a hurry for a very important appointment and was frugally filling the cart with all the basic necessities for both of them. However, whenever they went by toys or candy the boy wanted them badly and when he realized his dad wasn't going to get them for him his behavior turned into a full-blown temper tantrum.
Finally, Mr. Jagger removes his son from the cart and sternly tells him, “Listen carefully Micky. I am about to tell you something very important and you need to remember it for the rest of your life,” he pauses to catch his breath, “You can’t always get what you want, but if you try some time you’ll find you get what you need.