Cloud To Butt Plus
Chrome extension that replaces occurrences of 'the cloud' with 'my butt', and other amusing cloud-related substitutions.
Screenshot Gallery
http://www.flickr.com/groups/cloud-to-butt/
Installation
In Chrome, choose Window > Extensions. Drag CloudToButt.crx into the page that appears.
Safari Version
Can be found here: https://github.com/logancollins/cloud-to-butt-safari
Firefox Version
Can be found here: https://github.com/DaveRandom/cloud-to-butt-mozilla