Penny : Just thinking about the day I met you and Leonard.
Sheldon : It was a Monday afternoon. You joined us for Indian food.
Penny : Can you believe it's been eight years?
Sheldon : Yeah, and you're still eating our food.
Penny : I... can't remember a time you guys weren't in my life.
Sheldon : I remember it perfectly. But I have an eidetic memory.
If you're interested, I also remember how much you owe us for the food.