Classic Usage: I sort of don’t think that’s what HBS meant when she wrote, “. . . Marks patronized his joke by a quiet introductory sniggle.”
Classically Mad Usage: This reminds me a lot of plashy from The Scarlet Letter. Have I been mispronouncing giggle all these years? Yikes, I thought back then when I was worried that people had been snickering, or maybe nickering, at me it was just a joke. It turns out they were actually sniggling.