In Burning Black: A Raven's Mourning Tears, Remy goes into a fit of this after Timothy reveals he's partnered with Wanda. He's described as 'babbling incoherently' and 'frothing at the mouth ... in disbelief, incomprehension and utter hatred...'. It's so bad, he doesn't snap out of it until late the next day.
In Harry Potter and the Methods of Rationality, Harry drinks Comed-Tea, which guarantees a Spit Take for whoever drinks it. Testing it out, Harry drinks it, and immediately catches sight of an issue of the Quibbler, which proudly declares "BOY-WHO-LIVED GETS DRACO MALFOY PREGNANT!" Cue Spit Take. Harry and Malfoy are reduced to "Buh-buh-buh-buh..."
Too many competing objections, that was the problem. Every time Harry tried to say "But we're only eleven!" the objection "But men can't get pregnant!" demanded first priority and was then run over by "But there's nothing between us, really!"
Snape when he finds out about Harry dabbling in the Dark Arts in Pet Project.
Very early in With Strings Attached, Ringo is panting heavily, frightened out of his mind, embracing Paul, and angry at George; he spouts: "You're - I'm - glad - can't - George - asshole - he won't - ".