Grabbing a friends mobile when they go to the toilet etc and sending a random txt, for example.
"I've been keeping this a secret but, I wanna touch you."
Then holding your finger down on a the contacts, stop at random and send.
Delete the message from sent box before the friend returns.
Also known as Phrape
Hey Dave has left his phone on the table whilst nipping for a cig, let's play text roulette!