Fun with Spam

As I understand spam, the primary goal is to get the suckers to open the e-mail and click the links. Am I missing something here? Because it seems to me that you would want your subject lines to work towards enticing people into opening the e-mail. I just got a spam with the following subject line:

rattlesnake gonads around 1

I really don’t think that I’m going to open any e-mail that purports to be about reptile balls. It’s just not a topic I have any interest in reading.