1. Fights - You can't tell inflection and tha's a little to serious to just text.
2. Never text, "I quit", to your boss - Do it in person. It's unprofessional to text it.
3. I'm engaged! - News like that is for the phone.
4. I'm pregnant
5. Breaking up
6. Using sarcasm - again..the whole inflection thing.
7. Bad news - That should be done over the phone or in person.