To surprisingly poke an individual while scaring them. To achieve this you must run on the balls of your feet toward the individual while they are occupied with another activity or while they are just not paying attention. But be sure to run on the balls of your feet, as so they can't hear you coming towards them. When you get close enough (while still running) you poke them, HARD! And then run away laughing, because the individual will look hilarious afterwards. They will look like somewhere between the mix of having a heart-attack and surprize and pain.
Look at that person I just ninja poked! It is sooo hilarious!