"You — will — never — touch — our — children — again!"
And in the fourth book when Hermione starts a PETA-style organization for house-elves and Ron is trying to talk Hermione out of it
"They. Like. It. They like being enslaved!"
Hagrid yelling at Uncle Vernon, right before giving Dudley a pig's tail in book one?
"NEVER — INSULT — ALBUS — DUMBLEDORE — IN — FRONT — OF — ME!"
Ron's response, upon seeing that the congratulatory letter Percy sent him also included an advice to sever ties with Harry, was to tear the letter into bits before throwing it into the fire, muttering as he did so:
"He is — the world's — biggest — git."
Hermione to Ron in Order of the Phoenix upon the latter considering ordering harder drinks when the trio enter Hog's Head for the first time:
"You — are — a — prefect!"
Harry after Sirius falls through the veil and Lupin tells him he's dead:
"I. Am Not. Yoda." The titular character has just exploded a rubbish bin out of sheer rage at his stubborn, mouthy, disobedient and-at-risk-of-the-dark-side apprentice, who also complained about an assignment and tried. It's a proper danger sign when Harry won't even be placated by pop culture references.
"Fuego. Pyrofuego! Burn!"
Also seen in the final battle in Changes, in a duel of wills between Kukulcan, the Red King, and Harry.
Another Dan Abnett  novel, Know No Fear, features this for the speech of one of its characters, Telemechrus. Slightly inverted, in that he is a Dreadnought (Giant Mech containing the mortally-wounded fragments of a Space Marine hero) and it represents the machine systems processing his speech.
In Paper Towns, Margo says to Quentin, "I. Will. Miss. Hanging. Out. With. You."
Not with punctuation marks, but toward the end of the second book of Taylor Anderson's Destroyermen series, the destroyer Walker tries towing a much larger ship to safety. That cuts their speed severely, the enemy's guns are getting the range, and they can't maneuver to dodge. The engineer tells the captain they don't have enough fuel, the Bosun tells the captain it's no use, and the captain says, "We Are Not Leaving Anyone Else Behind." Then the captain of the ship they're towing cuts the line to let Walker get away.
From Metro 2033, when Artyom doesn't understand about Che Guevara:
'"Comrade. Ernesto. Che. Guevara." The commissar rapped the seperate syllables. "The great. Cuban. Revolutionary."'
Wings of Fire has a baby SkyWing dragon named Cliff say "I WANT. TO SEE. MOMMY KILL GRANDMA!"
In Void City, after Eric makes two failed attempts to perform a Fastball Special with Talbot, both of which end with Talbot missing his target and nearly plummeting to his doom, Talbot gives a firm refusal to Eric's suggestion of a third try.
Talbot: Do. Not. Throw. Me.
Cauldron of Ghosts: Chuanli delivers a low-key version after examining the carnage left by Battle Couple Victor and Thandi buzzsawing their way through a rival gang.