S11E01
Sheldon: Will you marry me?
......
Sheldon: I was having lunch with Dr. Nowitzki, and she kissed me.
Amy, Penny, Leonard: Excuse me? What? I am sorry?
Sheldon: In that moment, I realized that Amy was the only women I ever wanted to kiss for the rest of my life. So I came to New Jersey to ask her to marry me.
S11E24
Amy: From the first moment in that coffee shop, I knew there was something special between us. Even though I did work on a study that disproved love at first sight.
Sheldon: ironic, huh? I love the study the moment I read it.
Amy: Clearly, it was wrong.
