Is there any way to delete a shout from one's own userpage? There's a comment on mine that I find both clueless and rude, and I'd rather not see it every time I check my own profile. Blocking the offending party does not appear to have any effect.

This one is merely obnoxious, but if there's no way to clear shouts away, I can see them easily becoming a vector for some seriously abusive behavior.