Take That, You Inorganic Adhesive!

Yes, well, I am polymerized tree sap and you’re an inorganic adhesive. So whatever verbal projectile you launch in my direction is reflected off of me, returns in its original trajectory and adheres to you.

Source: Sheldon from The Big Bang Theory.

Explanation: Some people are rubber, some people are glue. Sheldon happens to be polymerized tree sap. I think it suits him.

Here are two clips from the show: