From the unconventional and awe-inspiring to the hilarious and heartwarming, here's a look at some of the most interesting photos, videos and stories that have our newsroom talking today. What's capturing your attention, filling your inbox and cluttering your Facebook/Twitter feed? Tweet us the stories you're talking about using #InstantIndex or email us at ABC.WorldNews@abc.com and they could appear on World News.

'50 Shades of Grey' Film Casts Christian Grey, Anastasia Steele It's official, Christian Grey and Anastasia Steele have been cast. E.L. James, the author of "50 Shades of Grey," broke the news on Twitter today that "Sons of Anarchy" star Charlie Hunnam has been cast as the young businessman Grey, known for his bondage sexual practices. "The gorgeous and talented Charlie Hunnam will be Christian Grey in the film adaptation of Fifty Shades of Grey," James tweeted today. She also announced that Dakota Johnson, daughter of actors Don Johnson and Melanie Griffith , will play Grey's love interest Anastasia. "I am delighted to let you know that the lovely Dakota Johnson has agreed to be our Anastasia in the film adaptation of Fifty Shades of Grey," James tweeted.

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727 Pound Alligator Caught in Mississippi When alligator hunter Beth Trammell captured a 723.5-ound alligator early Sunday, she broke the Mississippi record of 697.5 pounds. But it didn't last. A group of alligator hunters captured a gator the size of a small dinosaur just an hour later. Six men tangled with a 13-foot, 727 pound alligator for four hours, taking home the record for an alligator taken in alligator hunting season by a Mississippi hunter.

Police Boat Slams into Two Boats on Potomac River Police have some explaining to do after a bizarre boating accident on the Potomac River. The police boat slammed into two boats, apparently because it was too close while trying to make a U-turn at high speed. A stunned crowd watched the whole thing happen as the smaller boat partially sink. No one was hurt.