when you're trying to open packaging and it tears in the complete wrong place instead of where it's supposed to
You spend three minutes finding the tiny perforated line on the cereal box, trace it with surgical precision, and the moment you apply pressure it tears sideways through the back like the cardboard suddenly developed its own opinions about geometry. Now you're holding two pieces that don't fit together, a box that won't close, and the cereal is already staling out of pure disappointment.