I wouldn’t dare defile Douglas Adam’s memory by not mentioning that you should keep a towel with you at all times, but my second contender is a surprisingly short three-parter:
- never lie.
- never tell the whole truth.
- never pass up a chance to use a real bathroom.
If you don’t have time to do something right what makes you think you have time to do it twice?
Respect other people’s time. When dealing with a busy person in a professional context;