Sorry for picking on you unfairly – I can remove your tweet from this post of you like?
There is no doubt. however, that may people assumed they were retweeting a message from Stephen Fry. You’re right that I confused your tweet with one of them – that’s because “RT @x” is the syntax for a retweet from @x.
I think Twitter’s upcoming change to retweeting will help with this confusion (http://blog.twitter.com/2009/08/project-retweet-phase-one.html)
Incidentally, your tweet is only 108 character, giving you an extra 32 in which to quote the original author.