With this simple prank, you can make a friend's Siri call him/her something funny!
Step 1: Open ("Summon") Siri
Hold down the home button for a few seconds.
Step 2: Ask for the Name Change
Tap the microphone button and say "Call me [funny name]"
Replace [funny name] with something funny, such as "cheese face". Tap Yes on the confirmation.
Step 3: The Result
Siri will call your friend the funny name! If you are the victim of this prank, you can undo it by saying "call me [your name]."