Safety feature

As if the possibility of making a (possibly) life-changing phone call while under the influence of alcohol wasn't bad enough, with the increasing availability of email on people's phones, there's now the chance that a more enduring and no less embarrassing message may be released into the wild. But fear not, Google is on top of it. It's just released a new setting for its Gmail accounts (yes, they probably need to be set before drinking commences) where the user will need to correctly answer some simple mathematics questions before they can send email. Sounds reasonable. Now if only there was something like that for mobile phones!