Season 7, Episode 3 of The Big Bang Theory, "The Scavenger Vortex," Raj leads the crew in an epic scavenger hunt.

Looking back at each season’s most-watched episodes, it was clear what the audience craved the most: laughs, lovable weirdness, and a whole lot of heart. Even though The Big Bang Theory came ...

There's always that one couple on a sitcom who goes under the radar—and then suddenly, fans just can't help but go on and on about them.