Quotes / Punctuated! For! Emphasis!

Bill Corbett: Well, I think he certainly proved that THIS! IS! SPARTA!
Mike Nelson: Yeah, his kids make fun of him cause when he's handing out stuff on the 4th of July he insists on saying, "THIS! IS! A SPARKLER!"
Kevin Murphy: Or, when he's giving his car a tune-up and his kid asks, "Hey Dad, what's that small white thing with the metal at each end?" he always replies "THIS! IS! A SPARKPLUG!"
Bill Corbett: Or, when he sits down to a meal of juice, toast, milk, and Trix cereal...
Mike Nelson: Uh-oh, where's he going with this?
Bill Corbett: And he looks at his bowl of Trix and he says, "THIS! IS! SPART OF A BALANCED BREAKFAST!"
Kevin Murphy: Wow!
Mike Nelson: You pulled it off, nicely done!
300 (RiffTrax)

Bozo the Clown: It's now time to play Bozo's (Audience says along) GRAND! PRIZE! GAME!
— The opening to the Grand Prize Game segment on The Bozo Show.

"That many periods in one sentence can't be good for your brain."