See http://en.wikipedia.org/wiki/Wikipedia:ANI..._block_messages.
Admin Bobak has been placing "creative" messages on the talk pages of users he blocks, to let them know they are blocked. Some of the messages are slightly humorous, most are very immature and childish, and a few are really bad. Most agree that these messages reflect poorly on Wikipedia and show unprofessionalism, but some, like Baseball Bugs, dispute this, saying vandals have no right to being treated politely.
"Wikipedia already has somewhat of a reputation as a place run by kids, and if hundreds of people are being blocked with Bobak's messages, that bad reputation is just being reinforced. We need mature admins, not apparently childish ones." -- Deli nk