(paraphrased cause I can't remember the exact wording

)
Ryan: "Honey, I'm not going to make it tonight. Something came up."
Girlfriend: "What is that noise?"
Ryan: "It's an airplane."
Girlfriend: "Where are you going?"
Ryan: "I can't tell you that."
{Morgan Freeman}: "What are you doing? Tell her where you're going. In fact, tell her who you work for; she'll be impressed."
Ryan: "Okay, I work for the CIA and I'm on a secret mission to Russia."
Girlfriend: "(rollseyes) That is
so lame."
Also paraphrased:
What does his shirt say?
It says, "I make nuclear bombs. If you see me running, try to catch up."
--The Sum of all Fears