Survivor, The Sing-Off, Fish-like Scales

Survivor: Nicaragua, 8 p.m., CBS
Say it with me: Fah-Be-Oh! Fah-Be-Oh! Fah-Be-Oh! Fah-Be-Oh! This has been a great season. Best part so far? The way Probst says "Quitter." Like he's spitting. "Here are our quittersssss." So great.

The Sing-Off, 8 p.m., NBC
Oooooo: "The five remaining groups come together for a performance; each group sings a medley of songs by a single artist; the judges choose the contestants' next assignment." I love it when the a cappella groups start turning on each other. This is happening now.

My Skin Is Killing Me, 8 p.m., TLC
Really TLC? Like I'm not having enough trouble sleeping these days? You have to bring me this? "In Alabama, 5-year-old Payton struggles with a deadly condition called epidermolysis bullosa; in China, 22-year-old Cheng's mysterious skin condition causes fish like scales to grow over his body."