I wonder if it has anything to do with the way "an" sounds when spoken with an American accent. A mishearing and then repetition of "an accident" seems much more plausible to me than confusion with "on purpose".
"I lent a pen off him", "he lent me a pen". Could be a Northern thing though.
One I noticed in popular use a few years ago (Canada): the word "itch" as a verb, i.e.: "I itched it" "he was itching himself"
Sounds odd to me.
(So I just asked my employees - who are somewhat younger than me. They had heard of it, claimed not to use it, and believed it was poorly educated people with a poor grasp of English who used it in their experience.)
http://ell.stackexchange.com/questions/33544/what-is-the-dif...
What also bothers me that I've heard out of many British people, but never yet a Canadian or American is 'can I lend that thing from you?'... you can't lend something from its owner. As the lender, you are the owner of the property to be lent. Thus you can lend something to someone or borrow it from them, but you can't borrow it to someone or lend it from someone.