Assertion: big bang theory's episode | /r/HasProperty | the peanut reaction
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text: It is implied that at the end of the episode "The Peanut Reaction", Leonard begins to celebrate his birthday after Penny decided to throw him one after hearing that he had never had one; And one implication is at the end of the episode "The Russian Rocket Reaction" when Leonard asked Brent Spiner to come to his birthday party.