Harry Potter and the Chamber of Secrets
Fascinated, Harry thumbed through the rest of the envelope's contents. Why on earth did Filch want a Kwikspell course? Did this mean he wasn't a proper wizard? Harry was just reading "Lesson One: Holding Your Wand (Some Useful Tips)" when shuffling footsteps outside told him Filch was coming back. Stuffing the parchment back into the envelope, Harry threw it back onto the desk just as the door opened. (8.35)
Harry watched, amazed, as a portly ghost approached the table, crouched low, and walked through it, his mouth held wide so that it passed through one of the stinking salmon.
"Can you taste it if you walk through it?" Harry asked him.
"Almost," said the ghost sadly, and he drifted away.
"I expect they've let it rot to give it a stronger flavor," said Hermione knowledgeably, pinching her nose and leaning closer to look at the putrid haggis. (8.93-96)
As [the Gryffindor Quidditch team] walked out onto the pitch, a roar of noise greeted them; mainly cheers, because Ravenclaw and Hufflepuff were anxious to see Slytherin beaten, but the Slytherins in the crowd made their boos and hisses heard, too. (10.48)