Portal 2's Frankenturrets were a hilarious abomination, but there's absolutely nothing horrific about this perfect recreation of one by Corroder666.
The replica would be worth money/applause were it just something that sat there, but the fact he went to the trouble of making it move is just superb.
Frankenturret with twitching legs (Portal 2) [DeviantArt, via Ian Brooks]
Portal 2's Crimes Against Nature Immortalised In Mechanical Tribute