The - Loobenfeld Decaythe Big Bang Theory : Seaso...

This episode marks the very first time we see Sheldon's iconic "knock, knock, knock, [Name]" habit—though in this early version, it’s actually four knocks.

After hearing Penny’s "cringe-inducing" singing, Leonard lies about attending a symposium on molecular positronium to avoid watching her perform in Rent . Sheldon, unable to live with the "holes" in Leonard's story, decides to backstop the lie with an "un-unravelable web". Highlights & Trivia The Loobenfeld DecayThe Big Bang Theory : Seaso...

Before the chaos starts, Leonard and Sheldon have a classic argument about why an artificial intelligence like Skynet would bother making "petite, hot, 17-year-old killer robots". This episode marks the very first time we