Is it normal to poop in my friends backpack? twice?

When I was twelve, in the middle of class one afternoon, I was sitting in class not paying attention when I suddenly had a marvellous idea. I thought to myself, "I know how to spice today up!". So I raised my hand, and asked my teacher if I could be excused to the bathroom. I went to the bathroom, put some paper towel on the floor, shit on it, put it in a bag, and then put it inside of my friends backpack. I then went over to my friend, tapped her on the shoulder, and told her that "There's a surprise for you in your bag". I still remember the look of shock and disgust on her face, as I fell to the ground cackling in humour. Not that day, but afterwards, my friend and I continued to laugh about that day. Just this weekend however, my friend and I, as well as two other people decided to hangout for the night. Then, one of my other friends got the brilliant idea to relive that moment. So, off I went to the bathroom, a bag in hand, and a smirk on my face. I then proceeded to shit in the bag, and stealthily crawled across the floor, bag of shit in hand. I snuck the bag inside of her backpack, and moments later she looked inside to reveal the bag of shit. We all collapsed to the floor in hysterical laughter, clenching out stomachs in pain from laughing so hard. I'll spare you the parts of how I continued to hit her in the face with the bag. Now, take in mind that I am almost twenty years old. And I just shit in a bag, two days ago. I don't even need to ask if this is normal or not, bcos I already know the answer. I just wanted to share my weird poop story.