So there has been a bug found in the most recent iOS that effectively let's you crash anybodies iPhone. Just copy this below and send them a text message. You can change to first 2 words to be anything you want as long as the format is the same. Also, it won't work if they have their messaging app open when it is sent. Believe it crashes because of the way it displays the notification. Not sure how long this will stay around but I'm sure it can give you a good laugh or two.
effective.
Power
لُلُصّبُلُلصّبُررً ॣ ॣh ॣ ॣ
冗