How Do You Tell Identical Twins Apart? 

8. I went to school with identical twins. Chris and Brad. They looked so much alike that their parents bleached one of their hair until they hit puberty and started caring about their own styles.

9. My twin sisters may be “identical” but I swear one is slightly wider than the other. Like, an extra millimeter down the middle. It’s not the only difference but it’s the biggest one.

What set them apart very early on was an accident with a milk bottle that was too hot, scarred a patch on the tummy of just one of them, instant way to distinguish one from the other if there were any doubt. Not sure I’d promote that as a deliberate technique though.