Your
girlfriend: (casually browsing through your account): It says here under the People You Might Know category that you might know Joe Snuffy.
Who's that?
You: Oh, that was just my Testbook. I used it to check out people's profiles before I actually committed to Facebook.
Your
girlfriend: Wow, did you "Testbook" me before we met?
You: I plead the Fizzif, bitch!