This chainsaw isn't cutting properly. I'll use the file to sharpen it. That's odd, somethings not right here
Some twit has put the chainsaw chain on backwards.
Some body who wasn't paying proper attention has put the chain on backwards.
Somebody has put the chain on backwards, who did that? Someone wasn't paying attention. That is astonishing, shocking, incredible, typical, amusing. No wonder it wasn't cutting well, how did I not notice sooner.