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.
Never pass up an opportunity to sit down or relieve yourself. 95% of everything is crap, so appreciate it when you find the 5%.