Sheldon does not understand social norms.
Read MoreThe Wedding Gift
Howard buys the guys a “Fantastic 4” comic book to celebrate his upcoming marriage.
Read MoreSpock Being Rational
Penny buys Leonard & Sheldon a Star Trek Transporter.
Read MoreThe Endowment Effect of WOW
Sheldon's World of Warcraft account get hacked.
Read MoreWhat's in a Song?
Even though his ringtone purchase is a sunk cost, Leonard is unable to rationally select a new ringtone.
Read MoreSheldon Being Rational
Penny inquires as to why Sheldon did not buy Leonard a gift for his birthday.
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