commonly misused words - learn the proper usage of these words to get your way up to any English proficiency exams - IELTS, TOEFL, GRE, etc.
JERKING OFF TO THIS
OH GOD LESS VERSUS FEWER THANK YOU FOR ACKNOWLEDGING MY PERSONAL GRAMMATICAL VENDETTA.
By accident. On purpose. Never on accident.
Few native speakers make the less vs. fewer distinction.
Also, this could just be regional, but I don’t think I’ve ever heard an actual person say “by accident” (Ihave read it, however). There is nothing semantically linking the use of the particular preposition “by” to the abstract substantive “accident,” just as there is no semantic link between “on” and “purpose.” “By” implies adjacency, which doesn’t add anything to the meaning of the phrase “by accident”; Why must one be next to and accident but upon a purpose? There’s no logic linking these words, but rather arbitrary usage, and if usage is the gauge, then both are correct and you can stop being a prescriptivist elitist.