To the tune of “Battle Hymn of the Republic” (“Mine eyes have seen the glory of the coming of the Lord . . . Glory, glory, hallelujah . . .”)

I like bananas, coconuts and grapes (3x)
That’s why they call me TARZAN OF THE APES!

The motions:                                     The lyrics:                                         
Tap knees                                           I like
Clap                                                     bananas,
Knock head (gently!) with fists    coconuts and
Clap                                                     grapes
(repeat the above 2x)
Tap knees                                           That’s why they
Clap                                                      call me
Pound chest with fists                     TARZAN OF THE APES (sing loud!)

After we’re comfortable with this, we try different volumes: singing the verses softer and softer, and then yelling the last line, or reversing it, and mouthing the last line with no sound, etc.