Sneak Peek: Valentine's Day on 'Big Bang Theory'

ET has your sneak peek of this year's Valentine's Day episode of The Big Bang Theory.

http://www.usaweekend.com/VideoNetwork/2166583819001/Sneak-Peek-Valentine-s-Day-on-Big-Bang-Theory- http://lvideos.5min.com/728/5176728/517672758_1.mp4?5min=true&cat=Entertainment&subcat=TV&Cat_Id=346 http://www.usaweekend.com/VideoNetwork/2166583819001/Sneak-Peek-Valentine-s-Day-on-Big-Bang-Theory- http://pthumbnails.5min.com/10353456/517672758_c_embedstandard.jpg Sneak Peek: Valentine's Day on 'Big Bang Theory' ET has your sneak peek of this year's Valentine's Day episode of The Big Bang Theory. 13 ETtv5minmediaETonlineentertainment 03:33
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