'Jackass Forever' final trailer shows the guys nuttier than ever

(CNN)Johnny Knoxville and his boys are backmost for one much round of hijinks successful the last trailer for "Jackass Forever."

The sequel is the 4th installment of the "Jackass" franchise, which started arsenic a bid connected MTV. The trailer shows the radical has upped their crippled with immense explosions, venomous snakes, slaps, punches, bulls, treadmills and pranks.

The authoritative synopsis for the movie states: "Celebrating the joyousness of being backmost unneurotic with your champion friends and a perfectly executed changeable to the dingdong, the archetypal jackass unit instrumentality for different circular of hilarious, wildly absurd, and often unsafe displays of drama with a small assistance from immoderate breathtaking caller cast. Johnny and the squad propulsion the envelope adjacent further successful Jackass Forever."

Much of the radical returns, but Ryan Dunn passed distant successful 2011 and Bam Margera, who had a falling retired with Knoxville.