I tried it about 8 times before I heard anything, and I only got "going to the park" before I listened to the real audio version. I also have trouble understanding people in fairly mild noise if I'm not looking at their face, so I have to wonder if those are linked somehow.
I played the recording to another person without giving them any clues. They got the second half of the sentence on the first hearing and correctly understood the whole sentence after three hearings.
I heard it. I was also primed. I read the rest of the paragraph before trying it.
I've had enough psychedelic experiences though, so maybe that is it :-)
I hadn't read forwards when I tried it and I've had no psychedelic experiences, but I heard it too. I've only ever had the "normal" hallucinations, like phone vibration or once or twice hearing someone say my name.
I also primed myself before listening to it the first time and I heard it clearly. I've never had any psychedelic experiences.
Why be concerned? All audible speech is just sounds and a pattern recognizing filter.