Did you watch the "Grey’s Anatomy" season finale Thursday night?

We did — and can’t stop thinking about it! But first, we must warn you: This is one big spoiler alert, so if you haven’t watched it yet and plan to, do not read this post.

People are left guessing on the fate of two characters. Izzie and George. Dead or alive?

In the final few minutes of the finale, a last-minute spin puts these two lives on the line. Isobel "Izzie" Stevens (Katherine Heigl) has been battling cancer for most of this season. However, in the final show, she undergoes a risky brain operation that could eliminate her cancer — but might cause serious memory loss.

She survives the surgery and is cancer free, but is at first left with no long-term memory. And then, just when you think she’ll fully recover, memory and all, Izzie flatlines as her newlywed husband Alex Karev (Justin Chambers) watches in horror. While doctors struggle to resuscitate Izzie, you realize that the episode’s John Doe patient — who was stricken so badly by a bus that his face is unrecognizable — is none other than George O’Malley (T.R. Knight).

In the beginning of the episode, George erratically joins the Army and is stationed to leave the next day. He vanishes for most of the show only for Meredith Grey (Ellen Pompeo) to discover that he is the patient dying on the operating table. How did George end up in front of a moving bus? He heroically threw himself in front of it to save a woman he didn’t even know.

Meanwhile, Meredith and Derek Shepherd (Patrick Dempsey) can’t find the time to get hitched at City Hall, so they share a romantic moment in the doctor’s lounge to write their vows on Post-it notes. Cristina Yang (Sandra Oh) confesses her love for Owen Hunt (Kevin McKidd), while Miranda Bailey (Chandra Wilson) announces she’s divorcing her husband and not accepting her coveted pediatric fellowship.

In the final few minutes, there is a flashback from season two of Izzie in her prom dress heading to the elevator to meet deceased ex-fiancé Denny Duquette (Jeffrey Dean Morgan). This time, however, George, in Army clothes, greets Izzie in front of the elevator door. The elevator symbolizes the gateway to heaven, and viewers are left wondering if both, none or one will press the up button …

Series creator Shonda Rhimes spoke to EntertainmentWeekly.com about the jaw-dropping climax, but she leaves much up to our imaginations. When asked if it’s coincidental that both characters’ lives are left hanging in the balance, Rhimes says:

I don’t think there are any coincidences. I think Katherine’s stated publicly that she’s happy to stay. I think that there have been lots of rumors about T.R., but T.R.’s never said anything. Take from it what you will.

Take from it what you will!? Tell us: What do you think? Who lives? Who dies?