Satan's Calculator Trick

Display Satan's number 666 on a calculator. (Use a phone's calculator.) Slowly turn the phone upside down, but miraculously the number still reads 666. Best to watch the demo video below.

• no apps required
• set up takes literally two seconds
• phone can be borrowed
• virtually impromptu, no body else needed
• no screen shot switches, no toxic force
• no memory recall buttons to push