I was just thinking about this... and a great way to teach Spam Assassin is to make an e-mail you will never use. Try opajebha[at]domain.com. Then, send that e-mail out to all the great sites that love to send you spam. Move all of the e-mail you get to SPAM, as none of them will be HAM.
(I have the learnspam file to only check the inbox of the spam only e-mail address I used. You can try that too.)
And there you go.
