To blankpost #1: Hit enter a couple of times in the reply box
To blankpost #2: Hold alt and type 0173 (Microsoft Windows only); this creates a textless character that will leave you nameless if typed in the "name" field (no "Anonymous") or can be used to bypass wordfilter as well
Name:
Anonymous2009-07-01 2:43
I have a thrid way too, would anyone like it revealed?