Here is what the guitar plays at the beginning

G | ---4-4-4-4-5--5 | ---4-4-4-4-5--5 |  
D | ---5-5-5-5-5--5 | ---5-5-5-5-5--5 | 

they play that while singing this: (the notes listed are what the bass plays)

G 
I'm sorry I can't relate 
                   B 
I refuse to associate 
A                   C 
So don't go blaming me 
          G       C   G C 
for your bad hair day 
    G    C   G C 
bad hair day

Play the riff:
G      B      G   B 
I saw you yesterday 
    G           B   G  B 
You told me to go away 
A                C 
I guess you were having 
       G   C   G C 
a bad hair day 
     G    C 
bad hair day 
A                C 
I guess you were having 
       G   C   G C 
a bad hair day 
    G     C  G   C 
bad hair day

Solo:

Bass: 
E | ----------3/15-15-15------------- | 

Guitar: 
G | ----7-7-7---- | 
D | ----7-7-7---- | 

*Play the bass part first, then the guitar part. You'll have to listen to the song before you have the slightest idea what the heck I am talking about.

A                    C 
Would you like some aspirin
              G   C   G   C 
for your bad hair day
    G    C    G   C 
bad hair day 
A                    C 
Would you like some aspirin
              G   C   G   C 
for your bad hair day
    G    C    G   C 
bad hair day 
(end on G )