A great subject line that I have found that gets read is one that doesn't conclude until the reader opens the email.
Curiousity killed the cat, well I hope in this case it doesn't get the cat sick with a virus.
But the point is,is that people are very curious and they want to read about what they are missing. In this case, they are missing the rest of your subject line that leads to your email being opened.
“I would recommend this program to absolutely anyone because it has definitely created loyalty! There is so much competition in larger cities and when we opened our second location in Burlington, IA we needed to do something to set our bakery apart. I can think off the top of my head at least 15 customers who eat here 4 days a week just because of the card, where as before they would come only once a week. It has really worked well for us and has created a word-of-mouth to where we don’t even have to “sell” it anymore. It has been a win-win for both our business and our customers.”
* Martha Wolf
The Ivy Bake Shoppe & Café