Okay; usually I don't even see spam (though I notice the bandwidth hit, so I'm still brassed off by the stuff), but this was on a supplied account I'm using.
Usually they're deleted unread. But this one was remarkable in that it was so tiny. So I ended up reading it.
The entire email (less headers) ran thusly:
[font=monospace]%CUSTOM_RANDOM_TEXT[/font]
Yes! Yes! Gotta Have! Must see!
I love it: even spam software is too complicated for some mouth-breathers!