Secretly installed Automate app on my friend's Android phone to mess with him. (For those who don't know, with Automate you can automate anything on an Android device).
Made a 'flow' that would read his incoming sms's, and send an email to me with his exact location if I sent him an SMS saying 'where are you?'.
Was funny to mess with him and tell him his exact location even though we were miles apart.
Cleared it up for him a while later but it made me feel like #hackerman