The Boyfriend Complexity - S4-E9
Corrected entry: Penny tells her father that Leonard has to work tomorrow. But then we see Sheldon come up the stairs carrying laundry. Everyone knows Sheldon fits his laundry Saturday night at 8:15. And Leonard works Monday through Friday.
Correction: However, Penny's father might not know that. Also, it could be a case that since he works as a theoretical physicist that he may have to work weekends, like when he worked nights.
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