This story takes place during the events of "Life without Penny". Everything belongs to Lorre and Prady. Part 1, the Xmas party.
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Leonard was preparing to go out
"OK Sheldon, are you coming with me to the Caltech Xmas party or not?"
"No thank you Leonard, I have no intention to celebrate Saturnalia with you or anyone else."
"Come on, since Howard and Raj left I only have you to go with to social events."
"Well perhaps you will make a new friend at the party?"
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Next day in the Caltech canteen
"So there you are Dr. Hofstadter, one strike against you for not being there to drive me to work this morning."
"Well Sheldon you said said that I might make a new friend at the party, well I did. I spent the night at Leslie's place."
Then Leslie said "what a Dumbass."