I'm 39 and I know exactly what he's talking about. Pick up your average dollar store or Walmart incandescent flashlight, flip on the switch, and no light comes

I'm 39 and I know exactly what he's talking about. Pick up your average dollar store or Walmart incandescent flashlight, flip on the switch, and no light comes out. This is on a brand new, just out of the package flashlight. Tap or beat on the side of it, and suddenly the light comes on...for a little while. Then it flickers and goes back off, causing another round of tapping and beating. This is due to the bottom-of-the-barrel cheap components and construction of low cost flashlights. Often the components aren't lined up correctly, or the switch isn't making perfect contact, or the spring is too compressed to push the batteries up against the positive contact (which is often the base of the bulb). I can't count the times I've had to disassemble and repair a cheap plastic flashlight right after opening the package, just to get it to turn on and off reliably.