Red Kryptonite 

This is a person in which you typically would not be attracted to for a variety of reasons. Probably someone you wouldn't even be friends with. Yet for some unknown reason, when you are around this person, you start acting out of character. Your brain short circuits; common sense goes out the window; and your body goes into overdrive. You start disregarding your regular social norms and sometimes moral code. You want to act on purely erotic and selfish emotions. This person becomes an adrenaline rush. You become addicted, wanting the next high. Yet when they aren't around, you are back to your typical good person self. The best course of action is to avoid the red kryptonite because the price you will pay is rarely worth the experience.

That man is the red kryptonite to my inner Clark Kent, and I'm about to go very, very bad.

Red Kryptonite by FrancescaBella September 13, 2017

red kryptonite 

A variety of kryptonite created by Mr. Mxyzptlk that inflicts random physical changes in Kryptonians. Word has it that Mxyzptlk transferred a portion of his sample or stockpile to the obscure Internet user SonicDeathMonk3y.

Ben claimed that SonicDeathMonk3y's red kryptonite cremated his Pikachu.

red kryptonite by Eszett February 26, 2004