His Psychos lead him in.

The story:

Ok so my sons dad decided to introduce him to the wonders of The Who. My son liked the music and asked for it to be put on his ipod. He was singing this song on the way to school and I thought nothing of it til I heard him sing "his psychos lead him in" I just laughed and laughed. I said to him "What you listening to" he told me and I racked my brains trying to think what he had misheard as I was familiar with the song but had not listened to it in quite some time and couldn't bring the lyrics to mind.
Upon correcting him he listened to it again but still insists the lyrics are "psychos lead him in" even though he knows the real lyrics he just can't seem to sing them as he says he is so used to singing "psychos" he finds it weird to sing the correct lyrics.