Credit: Grey's Anatomy: ABC/CRAIG SJODIN

Here at PopWatch, we like to give your brain a workout. I mean, it’s not like any of us are going to get any smarter surfing for kitty-cat lamps on eBay, or doing Google image searches for My Pretty Pony, right?

So let’s get the blood circulating through our cerebrums by naming the single best moment on last night’s episode of Grey’s Anatomy. No easy task, of course, given that pretty much every scene in Seattle Grace Hospital is a winner, but for my money, Dr. Bailey (Chandra Wilson) getting caught baby-talking to the quintuplets (funny! heartwarming! unexpected!) earns a slight edge over Rosanna Arquette’s prison inmate swallowing a light bulb. Oh, and pretty much any scene with the underrated — and stunning — Katherine Heigl (left), who plays the put-upon Izzie as if she were an ugly duckling.

Argh. My noggin is starting to throb. I told you this was hard work. Take the Grey’s Anatomy challenge and see for yourself.

addCredit(“Grey’s Anatomy: ABC/CRAIG SJODIN”)