 On April 18, 2006, the first show where the phrase Monkey Tuesday was used, Penn read an email from a fan describing a childhood trip through a wildlife park where the fan and his brothers fed monkeys Certs through a car window.When the Certs ran out, the monkeys reached into the car and grabbed his brother.His mother sped up in an attempt to shake off the monkeys while at the same time his grandmother rolled up the back window, trapping the monkeys' hands.