He roller-coaster

from The Beatles – Come Together Lyrics on Rap Genius

“Helter Skelter” is a type of amusement park ride, classified as a “roller coaster”, even though it is more of a slide.

From the frenetic, schizoid-break nature of that song, “Helter Skelter”, it could refer to manic-depressive episodes, particularly when you pair it with the other diagnostics:
1.He roller-coaster(s)..
2.He’s got early warning
3.He’s got muddy water (diarhea)

Sounds like it could be about Sir Paul. Like many musical geniuses, Paul is well known for his mood swings, during these days….

“Helter Skelter” was sung by Paul.

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