We're not sure what they were going for with these storylines, but they just didn't pan out as expected. Bottom line: these were the worst plot twists of the year.
Sheldon: I'll have a diet Coke. Penny: Can you please order a cocktail? I need to practice mixing drinks. Sheldon: Fine... I'll have a virgin Cuba Libre. Penny: That's... rum and Coke without the rum. Sheldon: Yes, and would you make it diet?