This new The Hobbit: An Unexpected Journey picture from the LA Times depicts Bilbo Baggins after he has just fought some giant spiders in Mirkwood. It's a pretty important moment in the book for a couple of reasons, not least being that it's when Bilbo sort of comes into his own as an adventurer. It's also when he gives his sword its name, Sting.
The One Ring points out that the picture is probably an enactment of the following passage:
There was the usual dim grey light of the forest-day about him when he came to his senses. The spider lay dead beside him, and his sword-blade was stained black. Somehow the killing of the giant spider, all alone by himself in the dark without the help of the wizard or the dwarves or of anyone else, made a great difference to Mr. Baggins. He felt a different person, and much fiercer and bolder in spite of an empty stomach, as he wiped his sword on the grass and put it back into its sheath.
“I will give you a name,” he said to it, “and I shall call you Sting.”
Pretty cool, I think.