That's verbing a noun, but I don't think that's what is going on here. I think the title is trying to verb an adverb. If the "correct" sentence is "I accidenta

That's verbing a noun, but I don't think that's what is going on here. I think the title is trying to verb an adverb. If the "correct" sentence is "I accidentally created a scheme", then I think it would be "accidentallied". In excising the verb, shouldn't one carry its tense over to the adverb? If the "correct" sentence is "I created an accidental scheme", then it would be "acidentalled". But verbing the adjective doesn't have the same rhythm as verbing the adverb, in this case. And rhythm is the most important rule of English. The indefinite article needs to fall on a low note, and the adverb form is flexible enough to end on a high note to give a lilting affirmation, whereas the adjective form is not.