If a politician tells you that "everybody is joining his team", then this is called a Bandwagon Propaganda. Bandwagon is a persuasive technique of propaganda, wherein others are encouraged to do the same act as what others do because the majority of the people agreed in joining them. An example of a Bandwagon technique is, "Most of the people are voting for this candidate. We should vote for him too."
There are no adjectives in the sentence. Usher is a singer, making that a proper noun. Juggles is a action verb. Tennis Balls is a compound noun.
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