The way to evade Slashdot's lameness filter (whether you're just saying "first post!" or you're SHOUTING IN ALL CAPS) is to add in a link tag with some lowercase, normally spaced bunk in the URL. This can be added at the end of the comment and left unclosed (best way) or just closed immediately after it's opened (sometimes leaves a telltale underlined space).
E.g.
IF I EVER MEET YOU I WILL KICK YOUR ASS!
<a href="Twas brillig, and the slithy toves, did gyre and gimbal in the wabe...">