You've Been Using This Product Wrong Your Whole Life

9. Fuel Tank Gauge

The Best Store to Buy From: Unknown Product Price on Average: Unknown A lot of people make at least one weekly trip to fill up their petrol tanks. However, hardly everyone notices the small little arrow next to the gasoline gauge, and even those that do often don't know what it's there for.

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Fuel Tank Gauge / Twitter.com / DunlapFinancial Well, you can stop wondering. The location of your car's petrol tank is shown by the small arrow. By doing so, you avoid wasting time reversing and turning your vehicle around when you park on the incorrect side of the petrol pump. You can now fill up your car's tank considerably faster because you'll always know which side it is on. While most car owners find it easy to tell which side of the petrol tank is full, it can be challenging if you have purchased a new Ford or are using a rental. When you go to fill up, having this little reminder in front of you will save you time and avoid red faces.

10. Hole in lift door

The Best Store to Buy From: Unknown The typical product costs between $40,000 and $50,000*, including installation. You may be persuaded by horror films about eerie neighbours or haunted apartment complexes that there is someone hiding behind the lift door. You might even decide not to glance at it in case you catch a glimpse of someone else's eye.

Elevator Door Hole via Pinterest / Mrs Supot But that's not necessary to do so. Although there might be a cunning spy, it's much more likely that you'll be saved by that gap in the door. The key to the hole is in the hands of authorised staff, and it's there for emergency or maintenance needs. In the case that the lift becomes stuck, they can manually separate the doors.