This was a LONG time ago, but... I was an electronics tech without a job. I managed to talk to (not interview with) an executive at a company I wanted to work at but wasn't encouraged. He said something on the order of "Maybe later" and that was enough. He (or rather, his secretary) started to get calls from me every Monday and Wednesday morning right at their opening time to check whether Later might be now. Most of the time I was told he was busy. But after about a month they finally had me come in for an interview. I don't know if they were just tired of my calls or if they were impressed with my diligence. I was hired, and worked there for the next 14 years.