Chat them up.
Make the convo interesting. Discuss stuff with them. Let them open up and contribute to the conversation enthusiastically.
Continue that for the next five minutes.
Let them send one long ass message : probably about how they like you, how their day went,something interesting that happened to them, anything.
Just make sure it’s a long message whose subject matter is a thing of great importance to them.
As if in reply to the message, click on your message box and let your keyboard come up(of course, your data is still on). Drop your phone and go do something with your life : wash a dish, sweep a floor, anything.
All the while, typing… is showing on their side.
Do some stuff with your life a little more.
By now, it must have been about 25 minutes to half an hour that you’ve been away.
Come back, and reply with “k”
This was the reason why a high school student in California went to school with a revolver and shot a teacher, ten students and the girl he was crushing on. And that’s homicide, double homicide I think.
Alternatively, they might just smash their phone on the wall or jump over a cliff and come back to haunt you as “the Broken Bogeyman”.
You don’t know who needs to hear this, that’s why you should share it.

Fall!