I've tested thiese chords pretty well, and they are exact. ;D enjoy! 

Intro:
F Am Bb Gm

F                       Am
     Sometimes I get my head in a dilly
Bb               Gm
Feeling so lost, ticking you off
F
     Now boy, you know me well
          Am
Said, I’m that kinda feelling
Bb                 Gm
That kind of soft, that kind of silly
F                    Am               Bb
     But when I’m in doubt, I open my mouth
                   Gm
And words come out, words come out like

Chorus)
Dm                           Bb
Baby, there’s a shark in the water
        F                           C
There’s something underneath my bed

Oh, please believe I said
Dm                           Bb
Baby, there’s a shark in the water
  F
I caught them barking at the moon
C
Better be soon

F
F                    Am
High in the sky, the song that I’m singing
  Bb                  Gm
A sweet little lie, I cry wolf, cry
F                           Am
     Rabbit out the hat, so that’s why I’m bringing
     Bb                       Gm
Some tricks up my sleeve, for noticing me
F                             Am                          Bb
     I wouldn’t cause you any harm, I just want you in my arms
                      Gm
I can’t help, I can’t help myself

(Chorus)
Dm                           Bb
Baby, there’s a shark in the water
        F                          C
There’s something underneath my bed

Oh, please believe I said
Dm                           Bb
Baby, there’s a shark in the water
  F
I caught them barking at the moon
C
Better be soon
Dm 
(Do, do, do, do, do, do, do, do ,do)
Bb
(Better be soon)
F
(Do, do, do, do, do, do, do, do)
C
(Do, do, do, do, do, do, do, do)
Dm
Right is right

Rules are rules
Bb                            F
This is more like April fools
                     C    
I’m just winding you up, oh
Dm
Jack be nimble, Jack be quick
Bb                               F
Please don’t make too much of it
                C
It ain’t that serious, oh oh oh, oh oh oh

(Chorus)
Dm                           Bb
Baby, there’s a shark in the water
        F                           C
There’s something underneath my bed

Oh, please believe I said
Dm                           Bb
Baby, there’s a shark in the water
  F                       
I caught them barking at the moon
C
     You better get here soon
Dm                           Bb
Baby, there’s a shark in the water
F                            C
Baby, there’s a shark in the water
Dm                           Bb
Baby, there’s a shark in the water
  F
I caught them barking at the moon
C
Better be soon 
F

来源：www.ultimate-guitar.com