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If you're feeling a bit on the short side, measure yourself when you first wake up. According to Jamaica Hospital Medical Center, This phenomenon may be due to gravity compressing cartilage in our spine and in other parts of our bodies, such as our knees when we stand up or sit down throughout the day. "While we are lying down in a resting position, the spine is said to "spread out" or decompress, so when we wake in the morning we are taller after lying in bed all night.

Assuming you want to tip 20 percent for good service, move the decimal point one digit to the left and then double that number. It's that easy! For example, if a bill is for $35.50, you move the decimal to the left, which gives you $3.55. Double that number, and you've got $7.10—a 20 percent tip calculated in seconds.