Legs on Apple Power Cable
Most Macbook charges come with these little legs that flip out, but if you didn't know what they were for, you're about to kick yourself for not learning this hack sooner. They're for wrapping the cable around the charging brick, avoiding any entanglement. That makes it easier for traveling and protecting the cord.
Zig Zag on Bobby Pin
No one ever seems to know which side of the bobby pin is meant to secure your hair. Technically both work fine, but the grooved side is meant to press against your scalp because it makes it harder for the pin to slide out of place.