Sheldon hasn't secured a gift for Leonard's birthday party , making a big rant about why...until Howard has Penny inform Sheldon that gift giving is a non-optional social convention. Penny than takes him to shop for a gift.

Leonard doesn't celebrate his birthday; his parents (but mostly his mother and much less his father because of being cowed) focussed on celebrating achievements, and being expelled through a birth canal wasn't one. Leonard admits that he has never had a birthday party.

S01E16 - The Peanut Reaction

#thebigbangtheory #kaleycuoco #shellypenny

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