“Well, I really must not detain Your Magnificence any longer,” he said, “or keep you from much needed rest. Ponies take some catching, I believe, after a long start. And so do burglars,” he added as a parting shot, as he darted back and fled up the tunnel.
It was an unfortunate remark, for the dragon spouted terrific flames after him, and fast though he sped up the slope, he had not gone nearly far enough to be comfortable before the ghastly head of Smaug was thrust against the opening behind. Luckily the whole head and jaws could not squeeze in, but the nostrils sent forth fire and vapour to pursue him, and he was nearly overcome, and stumbled blindly on in great pain and fear. He had been feeling rather pleased with the cleverness of his conversation with Smaug, but his mistake at the end shook him into better sense.
“Never laugh at live dragons, Bilbo you fool!” he said to himself, and it became a favourite saying of his later, and passed into a proverb. “You aren’t nearly through this adventure yet,” he added, and that was pretty true as well.
The afternoon was turning into evening when he came out again and stumbled and fell in a faint on the ‘doorstep’. The dwarves revived him, and doctored his scorches as well as they could; but it was a long time before the hair on the back of his head and his heels grew properly again: it had all been singed and frizzled right down to the skin.

Chapter 12 Inside Information