Here's the riff that plays at the beginning: 
 
E|---------------------------------------------------5-5-------------------- 
B|---6---8------5/6----8-----5-6----------6--8--------8----------------- 
G|------------------------------------------------------------7---9--------- 
 
 
E|---------------------------------------------------------8--8------------ 
B|---6----8-----5/6----8-----5-6-----------8----10-------------------- 
G|------------------------------------------------------------------------- 
 
 
INTRO:   F     Bb    C     F             Bb      C 
 
 
   C        Bb                                                                            F           
Makin   somebody   happy  is   a   question   of   give   and   take 
 
                    Bb                                                                                       F 
You    can    learn   how   to   show   it   so  come   on   give  yourself a break 
 
Dm                                A                 Dm 
Every   smile   every   little   touch 
 
                                                     G7 
Don't   you   know   that   it   means   so   much 
 
Gm                                            
Sweet   sweet   kisses   so   tender 
 
                                           C 
Always   will   return   to   sender   like   a 
 
 
Chorus: 
 
F                           C                           Gm 
Bang     a   boomer   boomerang   dum   mi  dum  dum 
 
     C7                                        F                        C 
Mi  dum   mi   dum    dum    a    bang   a   boomer   boomerang 
 
      Gm                                 C7 
Love   is   a   tune    you   hum   mi   hum   hum 
 
            F                    F/Eb 
By    givin   away   I   think   you'll   learn 
 
Bb                                       G7              F 
You'll   get   love   in   return      so     bang 
 
                C                             Bb                     C7 
A    boomer    boomerang   is   love    a    boomer   boomerang 
 
         Bb 
Is     love 
 
 
BRIDGE: 
 
                            F                             Bb              F 
And   if   you're   warm   and   tender        I'll   kiss     you 
 
         C                           D 
Return   to   sender,    please   surrender 
 
 
Chorus: 
 
G                           D 
Bang     a    boomer    boomerang 
 
      Am                             D7 
Dum   mi   dum   dum   mi   dum  mi   dum   dum    a 
 
G                        D                                 C 
Bang    a   boomer    boomerang     is    love 
 
        D                                       G 
A    boomer    boomerang   is    love. 
 
 
VERSE 2:  Love is always around and you can look for it anywhere.  When you feel that you've found it my advice is to take good care. 
 Never use it as a selfish tool, never ever be such a fool.  Every feeling you're showing, is a boomerang you're throwing.