In highschool I used to cut in the bathrooms and sometimes during class. I would have a small knife up my sleeve and under the desk I would make it look like I was scratching my ankle under the pants, but I was actually cutting... I also did it once at work lately because a coworker unintentionally caused a flashback.

And last summer when the pressure was too high at work, while driving to my deliveries I would lift my shirt a bit and scratch my belly until it bled. Not my proudest moments...