Our DD started a Montessori toddler program at 18 months. Shortly thereafter, she started singing a song, the only word that I thought I could understand was "tractor". When I asked her teacher about the "tractor" song, the teacher had no idea what I was talking about. Soon we figured it out:

"the more we get together, the happier we'll be"

together sounded like "tractor" at 18-19 months. Unsurprising, really.