Applecart?

[freknu]

What is the idiom/rhyme used here: http://youtu.be/50uLeIvGtMs?t=3m55s

— (1)
— (2)
— Whose your friend?
— Him!

It sounds like "applecart", but that doesn't seem right. Is this an idiom/rhyme you are familiar with? What is the meaning and how is it used?

(EDIT)

Also, is there an English term for what is left after you've eaten an apple?

[Corybobory]

Donald duck says "apple core", which is the word we use for what's left after we eat an apple   I think Dale then repeats it - no idiom or rhyme, just 'point and say'

[freknu]

Ah! I thought it was something similar to "Marco? Polo!"

Apple core, right! Neither Donald nor Dale are particularly "clear", so it can be a little difficult to make out the words if you don't know it

[Corybobory]

Yeah!  I could understand Donald, and then Dale seemed to repeat it but I had to give it another lesson - funny enough I wouldn't have understood what he said next if you hadn't already written it here!!

[freknu]

I found the answer: https://ph.answers.yahoo.com/question/index?qid=20100119045400AAy8oWu

— Apple core.
— Baltimore.
— Who's your friend?
— Him!