This is the song Ricky Gervais sings to Elmo on the DVD "Elmo's Animal Adventures"

Chords Used:
Am: x02210
F : xx3210 (Or 133211)
C : x32010
G : 320033

Am (x02210@1)               FThe (133211@1)letter 'N' is what you need,
 C (x32010@1)             GWhen (320003@1)you take a nap,
 Am (x02210@1)                FNeed (133211@1)to put your nightshirt on,
    C (x32010@1)           GOr (320003@1)put on your nightcap.

Am (x02210@1)         F'N' (133211@1)begins nummies,
            C (x32010@1)           GWhich (320003@1)are really nice to eat
Am (x02210@1)                  F (133211@1)        
At night before you nuzzle down,
      C (x32010@1)        G (320003@1)In between the sheets

'N' goes:
Am (x02210@1)    F (133211@1)        C (x32010@1)        G (320003@1)NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

'N' goes:
Am (x02210@1)    F (133211@1)        C (x32010@1)        GNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN (320003@1)
Am (x02210@1)             FWhen (133211@1)you want to rest your body,
 C (x32010@1)             GLay (320003@1)your noggin down.
 Am (x02210@1)          FPut (133211@1)on your pyjamas
    C (x32010@1)            GOr (320003@1)put on your nightgown.
 Am (x02210@1)                FTell (133211@1)your niece and nephew
            C (x32010@1)                GAnd (320003@1)the neighbours down your street
      Am (x02210@1)        FThe (133211@1)letter N is really helpful 
 C (x32010@1)               GWhen (320003@1)you need to sleep

And 'N' goes:

Am (x02210@1)     F (133211@1)       C (x32010@1)      GNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN (320003@1)(x 4)

''Nighty night!''