1. If you don't absolutely, truthfully and unconditionally know the answer to a question, say you don't know. It's not a crime to not know every answer.
2. If you didn't directly see it with your own eyes; directly hear it with your own ears; touch, taste or smell it, do not EVER say you know for sure it happened. It's okay to say "I heard that ____ happened...".
3. Treat everyone with respect until they give you a reason not to. Do your best to greet every person who passes by. If you're tired of dealing with a shitty world, stop adding to the shittiness. You'd be surprised how many interesting people you will encounter when you start off with a smile and a "good morning!"
4. 9999.9999 times out of 10,000 the solution to a technical challenge involves people, not technology. It's almost always a defective process.
5. Software products are never really finished.
6. A certificate is nice, but it's no substitute for real experience.
7. Never trust a vendor who says "trust me"
8. Coffee is the greatest technological invention in the history of mankind. Beer is a very close second place.
9. Lesson number 8 should be taught from kindergarten through college.
10. What happens in Vegas usually ends up on Facebook.