A lot has happened during the nine seasons of Big Bang Theory. The cast has grown from five main characters to seven, or eight regular characters - if you include Stuart. Everyone has grown as a character, made important life decisions, but always continued to come up with crazy antics and put themselves in awkward situations.
So, we've gathered the top 5 biggest moments in the show so far to see just how far the characters have come since that fateful day Penny moved in across the hall from Sheldon and Leonard. If it hadn't been for that moment, many of the biggest and most life changing moments wouldn't have happened.
What are your favorite Big Bang Theory moments?
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[H/T YouTube/Shamy Central]
[H/T YouTube/Lord Treadwell]