The Hole in a Pen Cap  It’s not a design mistake!  It helps prevent choking by allowing airflow

Lines on Toothpaste Tube  Forget the myths!  Color strips don’t indicate ingredients — just for manufacturing sensors

Keyboard Bumps (F & J Keys)  Ever noticed those tiny lines?  They help you position your fingers without looking

Pocket in Jeans  That tiny pocket isn’t useless!  Originally made to hold pocket watches