What not to say...

The 'wrong' answers in a professional school interview:
-Why do you want to be a ____: because my parents want me to, or because I want to make a lot of money and run the world...hahaha...
-How will you finance your education?: I dunno. Or, I'll work in the summers (wrong, especially if there are no summer breaks...it's been said).

In any interview:
-What are your strengths?: I can lift 100 lbs. I can climb to the top of the ladder faster than you'll ever. I'm smarter than the anyone in the whole world!
-What are you weaknesses?: I'm a lazy procrastinator...but I can change - later.

To your kids:
-If you do this (or, if you leave this house), then don't ever come back.

To your parents:
-I'm like this because of you (If it's something bad). Or, I hate you.

To a girl (from a guy):
-Anything negative about her appearance.

To a guy (from a girl):
-Anything negative regarding his intelligence

*disclaimer: these are in general and may not apply in all circumstances or may be transferrable to other situations.