Public Service Announcement courtesy of Matt Carpenter: Do not leave your cell phone in a public place where it may be susceptible to good-natured pranks from your friends or family. While you are off somewhere else, completely unaware that your phone has fallen into the hands of merry pranksters, your Cardinals teammates, for example, might do this:
Don't feel too bad for Carpenter. It could've been worse: His Cardinals teammates could've tweeted "Carp stinks" from his phone.
Not that we'd want to give them any ideas, of course.