Little green girls really knock me out!

The story:

I was probably about eight when I first heard this
song, and I honestly thought those were the lyrics.
I think somewhere in the back of my mind I was
picturing that Beatles cartoon I had seen a couple
years earlier in which The Beatles are kidnapped by
an alien and forced to perform on her home planet.
They are subsequently chased by - you guessed it -
little green girls. It wasn't until middle school
when I learned a bit about the U.S.S.R. that I
finally twigged on the real lyrics.