C              Em7         F              Dm   Dm7
Ha - Ha - Ha - Haaa - Ha - Ha - Ha - Ha - Haaa
G              G7          C
Ha - Ha - Ha - Haaa - Ha - Haaa


A|--3--3--3--|
E|-----1-----|
C|--------2--|
G|--0--------|


C              Em7         F              Dm   Dm7
Ha - Ha - Ha - Haaa - Ha - Ha - Ha - Ha - Haaa
G              G7          C
Ha - Ha - Ha - Haaa - Ha - Haaa


A|--3--3--3--|
E|-----1--0--|
C|-----------|
G|--0--------| Play last notes (the 3, 0) of this on the first two Laa - Laas


            C                 Cmaj7
Laa - Laa - La -- Laa - Laa - La
          C7        F
La - La - La - La - La
            G                 G7
Laa - Laa - La -- Laa - Laa - La
     C
La - Laaa


A|--3--3--3--|
E|-----1--0--|
C|-----------|
G|--0--------| Play last notes (the 3, 0) of this on the first two Laa - Laas


            C                 Cmaj7
Laa - Laa - La -- Laa - Laa - La
          C7        F
La - La - La - La - La
            G                 G7
Laa - Laa - La -- Laa - Laa - La
     C         Csus4
La - Laaa





Repeat until every listener has goosebumps ;-)



This is only the main melody of the theme, not the whole song. 

The Dm7 is not necessary, but it sounds nice if you play it right after the Dm.

Instead of the Em7 you can also play Cmaj7 (for the guitar this is even the better chord). 
For my ears Em7 gives the best sound on the ukulele.
                                                                  Csus4                                          
Instead of the single notes between the Ha - Ha you can also play Csus4. Not like the 
original but easy to play.