One of the more amusing bugs in Google's default TTS is that it tries to read all series of numbers as integers (instead of digit-by-digit) no matter how long they are. I just got a FedEx email with a 22-digit shipping number in the subject line, which Voice Notify read as "FedEx tracking nine sextillion two quintillion ..."

It also reads DemandProgress.org as "demon progress", and before an update it read PayPal as "papal". It's like Hellsing in my inbox!