h2o2
H2O2 is the a***-hole formula for hydrogen peroxide, the liquid that turns your cuts into a scream-fest and makes you want to rip your skin off.
I used hydrogen peroxide on my arm and it felt like I was being burned alive.
My dad used H2O2 on his leg and he screamed like he was dying.
I put H2O2 on my wrist and it was like my wrist was on fire.