In addition to the usual list at http://www.bluesnews.com that I follow every year, here are a couple great ones that were perpetrated by or upon close friends:

A sysadmin friend:
http://saladofdoom.livejournal.com/2784.html

A friend who is embroiled in a long-standing war with the squirrels that keep ruining her garden:
http://www.blatherings.com/2009/04/squirrel-invasion