What would you do?

Okay, this is a theoretical question. Say you had placed a job listing on an internet board advertising for a clerical position, but the listing had a number of grammatical and spelling errors in it. One of the applicants responding to the listing, instead of submitting a traditional cover letter, decides to correct your errors and submits a letter that includes the corrected job listing. How would you respond to this? Would you be offended that the person pointed out your errors and ignore their application, or would you respond favorably to the person taking the initiative and demonstrating their grammatical expertise?