Sentence:  <WSD>Cause</WSD> of all this commotion : squat , pug-nosed , balding , hopelessly ugly Jean-Pierre Bravado , a Bogartian figure , who plays a sadistic , amoral , philosophic Tasti-Freeze salesman in old New-Waver Fredrico de Mille Rossilini 's endlessly provocative film , A Sour Sponge . 
Meaning of the word marked with <WSD> tags:  any entity that produces an effect or is responsible for events or results