I got an FBI record at age 11 from dabbling in cryptography (2015)
My FBI file was for hacking into my school district's AS/400 that handled my school's attendance and grading system.  Somehow using a public IP address with no access restrictions allowed a clear telnet path in from home.  Compounding username and passwords that were all the same for every employee.  I didn't change a thing, just LOLed and told someone.  Bad mistake. 
This was the late 90s.Oh well, 2 week suspension and kicked off the computers for less than a year.  A nice conference with FBI, police, my parents, IT and school administration.  Fun times.I learned my lesson to not talk about such things because their egoes were too fragile.When they decided to give students in their website design class ftp accounts on the district wide web/email server running an ancient version of Debian, they didn't disable the shell, just added a login script to a menu for pine, etc. for people who telnetted in, which I'm sure the sysadmin was proud of.  However, a few fast CTRL-C's broke out of his script menu loop and got me a shell, and they didn't shadow protect their password files.  Ran it through john the ripper and had half the district's e-mail passwords in a default dictionary file including the root pw in a few minutes.  LOLed and never told anyone about that.Good times, the 90s....