My baby donkey....

The story:

At first, I was surprised that John would say "My baby donkey,"
as it didn't seem to have anything to do with the rest of the
song, but then I heard the final six notes of the lead guitar, and
it sounds just like a donkey braying: "Hee-haw, hee-haw, hee-
haw," and so I was concinced.

Then my uncle told me the real lyrics, and even though I told
him about the braying sound-effect, he still didn't believe me! I
was so incredibly embarrassed!