A great ska song that's pretty easy to play on the acoustic. Naturally all of the chords 
are power chords:

  C  Cm  G  D  A
--3--3---3--5--5----|
--5--4---3--7--5----|
--5--5---4--7--6----|
--5--5---5--7--7----|
--3--3---5--5--7----|
--3--3---3--5--5----|

Intro:
C-Cm-G (strum each chord slowly) x1
C-Cm-G-G x8

Verse 1(not too sure about):
G-C-Cm-Cm x8

Chorus (same as intro):
C-Cm-G-G x4

Verse 2 (again... not too sure about):
G-C-Cm-Cm x4

Bridge:
D-A-G-G x4

Chorus (same as intro):
C-Cm-G-G x8 (end last chord with one strum)

Outro (same as intro):
C-Cm-G-G (until fade out)


Hope that helps! Any suggestions are welcome! Please feel free to comment as well!