“Blood spurted from his nose. Okay, I couldn't help myself. I burst out laughing.”

“On the way out Jeremiah turned around and danced a quick jig for me and i couldn't help it, I laughed. Over his shoulder Conrad said, "Good night Belly."

And that was it. I was in love”

“But I couldn't help myself, couldn't help the way I felt as I recalled the bliss and rush of a vampire's bite.”

“And of course I'm a chauvinist, but it isn't my fault."
"It isn't?"
"No, Jack was born first and I share his genes. I can't help it if he infected me inside the womb."
Briony burst out laughing. "I should have known that would be your excuse.”

“The highlight of my childhood was making my brother laugh so hard that food came out his nose.”

“GO FOR HIS EYES! OR BITE HIM ON THE NOSE! DRAGON NOSES ARE VERY SENSITIVE!"
Oh, very helpful, Camicazi, very helpful… thought Hiccup. What if he doesn't obligingly hold me up to his nose? What if the only part I get close to is the TEETH?”

“He burst into one of his rare fits of laughter as he turned away from the picture. I have not heard him laugh often, and it has always boded ill to somebody.”

“Disappear where?" You know what they say: Curiosity killed the mutant bird kid. But I couldn't help myself.”

“He bursts out laughing. It's short, as if he regretted allowing me to make him laugh, but the satisfaction's already mine.”

“"So you're supposed to give us some advice", I say to Haymitch.
"Here's some advice. Stay Alive," says Haymitch and bursts out laughing.”