Quote 1, from the Magnus Chase and the Gods of Asgard series:

He charged down the hall screaming, "DEATH!" while the smiley faces rippled on his boxer shorts.

Mallory's face turned red-with embarrassment or delight, I couldn't tell. "I'll stay with X in case the squirrel breaks through," she said. "T.J., you take them to recycling."

"Yeah."

"Recycling?" Blitz asked.

Mallory drew her sword. "Magnus, I can't say it's been a pleasure. You're a true pain in the nári. Now get out of here."

-Page 158, The Sword of Summer

Guesses here! >>>