The trick to the virtual tarot fortune teller Peter Answers is the "Petition" field where the person who playing the prank supposedly types "Peter, please answer:" In reality, however, the person playing the prank is already typing the answer on the petition field without the other observers noticing. This is because the petition field only displays the words "Peter, please answer" no matter what is being typed in the field.
For the trick to work, the person who is playing the prank must be able to type correctly without being able to see he is actually typing. To begin typing, the person who is playing the prank must begin by typing a period before typing the answer and another period after the answer. If the answer is short, he must pretend to type until the phrase "Peter, please answer:" is completed.