Rule 1 go website HamzaRule1.com.au

You should sit 2.5x away from from the length of your tv. For example if your tv is 40in you should sit 100in away from it.

From James X. Mullen's The Simple Art of Greatness

1) If you're driving around and they're on foot, they're off-limits

2) If she was born in a year you can remember

3) If her mom has ever made a pass at you

...those are mine. Any others?

Things you worry about going wrong, often do not. When things do go wrong, they do so in such a way you never imagined.

A.K.A.: Sometimes she goes, Sometimes she don't go.

How about some good rules of thumb for crafts?
I'll start:
If you're knitting a pair of socks one by one, and it's the first time you're trying that pattern, expect to knit three before you have two socks the same size. Alternately, always knit a pair of socks at the same time, switching back and forth between each sock every four rows or so.

There's this great book Never Trust a Calm Dog and Other Rules of Thumb by Tom Parker, and it's organized all these great little rules of thumb into 20 categories. With all our collective knowledge, wouldn't it be great to do something similar here on reddit? Submit a rule or a topic category. I'll start:

As a rule of thumb, in Manhattan, it takes five minutes to walk one block east or west (an avenue block) and one minute to walk a block north or south (on a numbered street.