Source: var x = /twitter.com\/.*\/status\/([0-9]+)/.exec(window.location.href); if(x == null) {alert("Doesn't look like this is a tweet.")} else {window.location='twitterrific:///tweet?id='+x[1]};
Converted to bookmarklet: javascript:(function()%7Bvar%20x%20%3D%20%2Ftwitter.com%5C%2F.*%5C%2Fstatus%5C%2F(%5B0-9%5D%2B)%2F.exec(window.location.href)%3B%20if(x%20%3D%3D%20null)%20%7Balert(%22Doesn't%20look%20like%20this%20is%20a%20tweet.%22)%7D%20else%20%7Bwindow.location%3D'twitterrific%3A%2F%2F%2Ftweet%3Fid%3D'%2Bx%5B1%5D%7D%7D)()
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