Go and see The Lego Movie. Drop whatever you are doing and go and see The Lego Movie. Right now. Immediately. Get in a car or on a bus or run, don’t walk, to your nearest cinema to go and see The Lego Movie now. Do it. Vamanos.
Frank Castle picking off one of the Parkour couriers with a grenade launcher was intended to show the director's (and her presumed audience's) dissatisfaction with the use of Parkour in films, such as this film, Casino Royale, and District B13. (Source: Director's Commentary).