Anyone who hasn't figured it out: it's a trick. He gets the answers right by the people typing their answer into the petition box. You type a period, then the answer you want Peter to give, then another period. It will show up as "Peter, please answer the following question:", but your answer is registered. Once you're done typing the answer, finish the sentence that comes up, then a colon, then type your question.
Try this:
Petition: .Cock jokes.e answer the following question:
Question: What are the best type of jokes?
Sorry to spoil everyone's fun.