NOTICE: This was put together for @paddymoogan's MozCon presentation and is currently exclusive to MozCon attendees. Please don't share it just yet.
TwitterPounce is a proof of concept tool that I put together for a bit of fun. It will connect to your Twitter stream, as a regular Twitter client would, and will sit listening for the user that you indicate to Tweet something, and as soon as it see's the user Tweet, it'll Tweet at them with the message you specify, then it'll quit!
Use it to play jokes on your friends, to try and get the attention of celebrities, or modify it for customer service -- just don't blame me if you annoy people or Twitter tells you off. :)
A few shout outs to those whose code I stood upon the shoulders of:
Download the tool: TwitterPounce