The mysterious phrasing, which first came about in October 2012 on the Android support page, was publicized by Hacker News last night, resulting in some hilarious sentences.
One altered spoken sentence, for example reads, "Larry Page used to use an Android. But that is now at an end, he now praises the iPad."
This bug can be easily reproduced using Google Translate. Type any sentence, end it with one of the key words, and the text-to-speech option on the site will add "he now praises the iPad" to the sentence.
There's no word on why this phrasing exists in the code, but Hacker News speculates that it is an error in the algorithm. The original sentence came from a MacNN article posted in 2011, quoting Hearst Magazine president David Carey: "Describing the negotiations last spring as being filled with 'so much drama,' he now praises the iPad."
Theoretically, Google's algorithm improperly incorporated this sentence, causing the bug. Thus far, Google has not resolved the problem, so for the time being, Google Now and Google Translate can still be used to create humorous sentences.