Bread and butter down the leg is good, but the whole scene is just so ever-green.

tl;dr: "It's a mercy you ain't bolted dead!"

"Joe was evidently made uncomfortable by what he supposed to be my loss of appetite, and took a thoughtful bite out of his slice, which he didn't seem to enjoy. He turned it about in his mouth much longer than usual, pondering over it a good deal, and after all gulped it down like a pill. He was about to take another bite, and had just got his head on one side for a good purchase on it, when his eye fell on me, and he saw that my bread-and-butter was gone.
The wonder and consternation with which Joe stopped on the threshold of his bite and stared at me, were too evident to escape my sister's observation.
"What's the matter now?" said she, smartly, as she put down her cup.
"I say, you know!" muttered Joe, shaking his head at me in very serious remonstrance. "Pip, old chap! You'll do yourself a mischief. It'll stick somewhere. You can't have chawed it, Pip."
"What's the matter now?" repeated my sister, more sharply than before.
"If you can cough any trifle on it up, Pip, I'd recommend you to do it," said Joe, all aghast. "Manners is manners, but still your elth's your elth."
By this time, my sister was quite desperate, so she pounced on Joe, and, taking him by the two whiskers, knocked his head for a little while against the wall behind him: while I sat in the corner, looking guiltily on.
"Now, perhaps you'll mention what's the matter," said my sister, out of breath, "you staring great stuck pig."
Joe looked at her in a helpless way; then took a helpless bite, and looked at me again.
"You know, Pip," said Joe, solemnly, with his last bite in his cheek and speaking in a confidential voice, as if we two were quite alone, "you and me is always friends, and I'd be the last to tell upon you, any time. But such a — " he moved his chair and looked about the floor between us, and then again at me - "such a most oncommon Bolt as that!"
"Been bolting his food, has he?" cried my sister.
"You know, old chap," said Joe, looking at me, and not at Mrs. Joe, with his bite still in his cheek, "I Bolted, myself, when I was your age - frequent - and as a boy I've been among a many Bolters; but I never see your Bolting equal yet, Pip, and it's a mercy you ain't Bolted dead.""