Never smile at a crocodile. --

Related:

• Never MOON a werewolf. --
  Survival Tip...
• Never invite Cthulhu over for a bite. --
  Survival Tip...
• HEALTH TIP #1:
  Never Agree to Trading Stools in a Gay Bar...
• Intel 586 Troubleshooting Tip 1:
  Refrigerate Computer...
• A communist is like a crocodile: when it opens its mouth you cannot tell whether it is trying to smile or preparing to eat you up.
  Sir Winston...
• The word that's on the tip of your tongue?
  You'll never remember it...
• Tip of the Day:
  Never fry bacon in the nude...
• Do not iron, naked. --
  Home safety tip for men...
• Never bow to authority, but always tip your hat.
  - Jim...