Sheldon and His Cousin

Sheldon hires some guy to pose as his cousin, Leo, to pretend to need an intervention for Sheldon to avoid going to see Penny in Rent.
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Sheldon's Cousin

Sheldon has one of his co-workers post as his non-existent cousin, Leo, in order to get out of seeing Penny in Rent.
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Leonard Talkings His Way Out

Leonard attempts to talk his way out of going to see Penny in Rent after hearing her sing off key.
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The Big Bang Theory Season 1 Episode 10 Quotes

Sheldon [knocking on Penny's door]: Penny, Penny, Penny...
[Penny opens the door]
Sheldon: Good morning.
Penny: Do you have any idea what time it is?
Sheldon: Of course I do, my watch is linked to the atomic clock in Boulder, Colorado. It's accurate to one-tenth of a second, but as I'm saying this it occurs to me once again your question may have been rhetorical

Sheldon: I'm uncomfortable having been included in your lie to Penny.
Leonard: What was I supposed to say?
Sheldon: You could have told her the truth.
Leonard: That would have hurt her feelings.
Sheldon: Is that a relevant factor?
Leonard: Yes.
Sheldon: Then I suppose you could have agreed to go.
Leonard: And what would I have said afterwards?
Sheldon: I would suggest something to the effect of, 'singing is neither an appropriate vocation nor avocation for you, and if you disagree I'd recommend you have a CAT scan to look for a tumor pressing on the cognitive processing centers of your brain