The toughest choice of all: Should you buy an Xbox One or PS4?
To make sure he makes the best decision, Sheldon is working with a full bladder, because research shows that you make the best decisions when you really, really have to go to the bathroom.
WATCH: 'Big Bang Theory' Cast Rocks 'Rocky Horror'
Meanwhile, the Big Bang gang discusses the ups and downs of dating multiple people at the same time.
Check out these two sneak peek clips from the upcoming episode of The Big Bang Theory, airing tonight at 8/7c on CBS.