1. Your Gut Tells You Something Is Up
2. They Protest Too Much
3. They Have Little Secrets
4. They Have "Data Confusion"
5. Your Friends and Family Don't Trust Them
6. The Story Changes Upon Retelling
7. Their Eyes Are Always Searching
8. Change in Spending Habits
9. They're Too Good to Be True
Someone from their past makes you feel uneasy.
All images courtesy of STX Studios