We’ve all done things in the past that we look back on now and wonder what the fuck we were thinking. Thanks to the anonymity of the Internet you get to realise you’re not alone, not by a long shot.

Here are the best submissions from Reddit users when asked about the creepiest, most obsessive things they have ever done:

(Use your arrow keys/slide on mobile to view the images.)

neuroPSYK:

Had a crush on this girl during high school, but she didn’t know it. One day in class, I accidentally sliced my finger open pretty good with a pair of scissors. I was sent down to the nurse and passed her locker on the way there. For some reason, I thought it would be a ‘cute’ idea to anonymously draw a giant heart on her locker with my blood… In retrospect, it was not cute at all. I never told her I did it, and played along agreeing how creepy some kids in our high school were.