9. Voice commands
This one is best performed on a friend who isn’t a tech-savvy. Introduce yourselves as a customer service representative from his phone company and inform him that a new service has been activated on his phone, allowing him to control it with voice commands, but it has to be calibrated first. Then proceed to ask him to repeat a few phrases so that the service can be activated properly. Start easy and gradually increase the silliness in your sentences and see how far you can you take it before they realize it is a prank.
