The Jacket's Half-Belt
If you've ever owned a trenchcoat, then you know that there's a weird half-belt on the back of your jacket, but you probably don't know what it's for. They're actually a memorial to soldiers who used their trenchcoats to hold their blankets. The belt held extra material in place while the soldiers walked around.
The Hole at the End of the Tape Measurer
While tape measures are meant to be a simple tool to make your projects easier, they're actually laid out pretty confusing. With both imperial and metric units, it can be tricky to tell which side is the right one to use. However, the hole at the end isn't pointless, it's meant to hold a nail in place so every measurement is perfect.