There are a few tricks about. Some only work
for particular browsers(or versions) <sup>
inside <sub> for example.
Also
Subject and message valid character filters are different.
(
Tahkcalb ω∞ for sigs,
Tue 16 Sep 2008, 6:37,
archived)
Talking in strange tongues with an empty subject.
Witch! Witch! *points and shakes*
(
I smash things in my sleep uruk-hai ...and I'll look low. Now where'd they go?,
Tue 16 Sep 2008, 6:59,
archived)