Smallville - Season 8, Episode 5
After leaving their engagement party, Chloe and Jimmy are abducted by a psychotic jeweler. Once emotionally scarred by his wife's infidelity, the jeweler now kidnaps couples and subjects them to a kryptonite-enhanced lie detector that will shock them if they lie. Chloe is asked if she is in love with anyone else. Meanwhile, in an effort to find Chloe and Jimmy, Clark and Lois pose as a couple -- as such, they are then kidnapped and asked how they feel about each other.