Even though you may be nervous about talking to random people, the worst you can get is "Go away".

Do not buy your girlfriend or wife flowers in an attempt to make nice after you pissed her off. Every time she looks at the flowers, she will just be reminded that you pissed her off, unless she has the memory span of a goldfish.

To keep lettuce fresh for days longer, wrap it in paper towels instead of inside a plastic bag, it works very well.

Cubes of sugar in biscuit barrels help the biscuits stay crisp.

To clear your sinuses, eat a lot of wasabi. It will hurt tons, but your sinuses clear almost instantaneously.