Chris Thomas stated that the 9 September session , for the Helter Skelter recording , was especially spirited .
According to Chris Thomas , who was present , the 18 July session was especially spirited : `` While Paul was doing his vocal , George Harrison had set fire to an ashtray and was running around the studio with it above his head , doing an Arthur Brown . ''
Helter Skelter -LRB-song-RRB-