Bones Sketch: Don't Know What That Means

Well, my first attempt at a new fandom of mine: Bones!
These are (supposed to be) Bones & Booth from said series. I got totally hooked on that series, especially now that I'm nearing the finale of Season Six! Fans of the show will know what I mean!
Unfortunately, I haven't nearly seen all episodes yet. I own Season One on DVD, have seen like the first half of Season Four and the second half of Season Five on TV, and now almost all of Season Six. But this pencil sketch was done with reference from an episode I haven't seen so far, and I don't even know which one it is! Maybe someone can help me on this? Bones & Booth seem to be in some kind of museum together.
My inspiration was this fan-made music video: www.youtube.com/watch?v=YKI1Qb…
The song totally fits! Well, maybe someone can tell me which episode that scene was from.
Now, I really don't know if Bones came out that great, but I'm kinda proud of how Booth came out. And for a first attempt, I'm actually proud of the whole sketch. Took me something like an hour, I didn't keep track really.
Oh yeah, and the title is kinda random, but I really like Bones' repeated line: "I don't know what that means." Well, and I thought it might fit, like, Bones doesn't know what those looks she and Booth are exchanging mean!
Hope you like it!

Click "Download" to view the full-sized image (1600 x 1000 pixels)!

EDIT: Now, I know what episode this is from! I own Season Five on DVD now, too!

Here's another pencil sketch I made: Bones Sketch: Got You Where I Want You