Listen to the song for the rhythm. It's from the Jackass 2 soundtrack listen for it at
end of the film when the credits are rolling.
Not a difficult one to do or to figure out. I personally find it fun to just play around 
this song and add in your own little bits.
And it's a great little doozy for when you are first learning guitar.

Intro: G

GSometimes (320003@1)I don't know if I'll make it
                                   CSometimes (x32010@1)I wished I could walk away
DSometimes (xx0232@1)I don't know if I'll make it through
                                  GBut (320003@1)you know I'm gonna do it anyway

GGot (320003@1)a guitar and a heart that's been broken
                                  CA (x32010@1)sorry gig and borrowed cigarettes
DA (xx0232@1)song I wrote for them jokers out there tokin'
                                                           GAnd (320003@1)a cherry master chokin' mean old Knoxville half to death

Oh, sometimes I don't know if I'll make it
Sometimes I wished I could walk away
Sometimes I don't know if I'll make it through
Hell, you know I'm gonna do it anyway

Got a Jezebel and a hotel for shelter
A Jag I've been draggin' 'round for days
And a big mouth that had to go and tell her
What her big mouth momma told her anyway

Yeah, sometimes I don't know if I'll make it
Sometimes I wished I could walk away
Sometimes I don't know if I'll make it through
Well, you know we're gonna do it anyway

Yeah, sometimes I don't know if I'll make it
Sometimes I wished I could walk away
Sometimes I don't know if I'll make it through
But, you know I'm gonna do it anyway