More dangerous trick plays normally combine multiple passes or hand-offs than a single play. In the Flea Flicker, the ball is handed-off or laterally passed to a player in what appears to be a rush play. The player then passes the ball back to the quarterback, who throws it to the receivers. Properly timed, the defensive team will have started responding to the rush by moving forward, leaving the receivers wide open. However, timing the play is difficult, and with two lateral passes and a forward throw, the chances for error are great. A failure leaves the ball behind the line of scrimmage in what will almost certainly be a loss of yards. The play also requires all passes prior to the final one thrown by the quarterback to be either parallel to the line of scrimmage or backwards, since only one forward pass is allowed per play. Multiple forward passes will result in a penalty.