Yahoo has such crappy spam filtering

How in the world did this not get caught by yahoo mail's spam filter?? I mean, seriously? I mean, the spammer's code was buggy enough that %RANDOM% didn't really get resolved as anything random, but yahoo still can't catch such a frequently abused subject line? What the hell?!

Date:	Sat, 27 May 2006 00:59:43 +0900 (JST)
From:	yas.i@d8.dion.ne.jp Add to Address Book Add Mobile Alert
To:	d2@jizzkids.com
Subject:	Teen smiling while her pussy destroyed %RANDOM%

Teen first time masturbating with a toy
Four pretty teenies banged by lucky guy
lionnet.infotg/an/003/






%TOE%
Her eyes widened as they fell on the broomstick in Harrys