What lesson did you learned the hard way?

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The lesson i learned the hard ways was how follow the rules in my high school. I never liked to follow my uniform policy in my school and i also never wore ID because it always bother me. I hated wearing same cloth and going to skool....i thought it was cool to not follow...But few days went by very easily and after that i got suspended .....My dad was angry....So yeah that was what i learned hard way....................................What are the things did you guys learn the hard way..........