Michael Ausiello of Entertainment Weekly has a brief tidbit on what happens in the upcoming Private Practice / Grey's Anatomy crossover event in his spoiler Q&A today.

Here's what he says is on tap:

Q: What is the cast of Private Practice going to do over at Grey's Anatomy?

A: Filling Meredith's pretty little head with shocking stories about Derek's early days ** * **********. And believe me, that's not a good thing. Funny? Yes. Good? No.

Can you fill in the blanks? In a fraternity, perhaps?

On a similar note, Matt Mitovich of TV Guide also says Derek's past will be touched upon in these episodes, as Addison, her brother Archer, and perhaps even Sam and Naomi (from their medical school days) share a history with McDreamy as well.

What do you think will be revealed - and how will it play out with Meredith?

Who was McDreamy before he was McDreamy?

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.