He said that it happened today while his phone was charging, and when he opened a text from me, his phone had something about a barbecue typed in it. The last time he brought it up, I guessed that he was probably pocket typing and it was autocorrecting, but that didn't seem to be a possibility today. He said that it sometimes seems like someone is "writing cheeky things over [his] shoulder." He's really worried that it's hackers (because they would obviously want him to randomly text about barbecuing), and I have no idea what to tell him. Any thoughts?