This is the case for both me and my twin brother. I am more violent/insane than he is and likely to cause serious harm to any given person, whereas I compare him to Jigsaw.

When this Troper and her identical twin visited the FBI's crime lab museum, one of the facts the tour guide gave was that DNA could be used to positively identify anyone in the world, but could not tell the difference between identical twins because they are natural clones and share the same DNA profile. My twin then turned to me and quipped. "Don't do anything stupid."

WildMassGuessing: HAL to Watson?

My brother and I used to joke about this, but circumstances have made it less funny. One of us outgrew it.

When this troper was in high school, two of her teachers (debate and theater) happened to be twin brothers. The debate teacher insisted that his brother was the evil twin, and yes, the theater teacher ''did'' have a beard. Both of them were nice guys, though.