In The Big Bang Theory's tenth season, the episode "The Hot Tub Contamination" shows Sheldon telling Penny why he does this.

Young Sheldon is filled with small but significant nods to The Big Bang Theory, references that go beyond Sheldon’s quirks and pop culture obsessions. These moments not only tie the prequel to its ...

It's not a wedding, it's not a breakup, and it doesn't have a major cliffhanger. So why do fans love this 'Big Bang Theory' ...

From the pilot episode to the final, The Big Bang Theory has been about Leonard and Penny's relationship. From their multiple ...