Two stupid things I recently have done.
While talking on my cell phone, I got in the car, and used my right hand to pull the door closed. The door slammed on my left elbow, with my left hand holding my cell to my face and I effectively punched myself in the mouth.
I did an hour and a half on the treadmill, the friction of my shirt wore against my nipples. After a shower and a change to head to the pool, I sprayed some sunscreen on, which turns out is mostly alcohol based in spray cans, and omg the pain.
Thank you, carry on.