'Young Sheldon's Most Memorable Moments: 'The Big Bang Theory' Easter Eggs, Guest Stars and More!

From Sheldon Cooper's hilarious fears to his socially awkward encounters, ET takes a look back at our favorite moments from 'Young Sheldon' as the series wraps up its run. The seventh and final season of 'The Big Bang Theory' prequel premieres on Thursday, Feb. 15, on CBS.