Stopping a text from sending?

[Heaven Can Wait]

Well, I drank a little and sent the wrong text to the wrong girl, using someone else's name, however i realised this during the sending mode (im pretty sure this text hasn't actually sent) and turned my phone off, but i know that as soon as i turn it back on it will send the text again, is there anyway of stopping this?
im thinking a lead bunker will be needed.