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He speaks in threats, bluffs and declarations, and when he gets hopped up, his hair stands on its end.

"When I first met Riley he already knew he was going to lose the bottom half of his leg and he was practicing hopping up the stairs," Mr Day said.

Yorke responds by telling the heckler to "hop up on stage" to make his remarks.

Also wearing a too-small T-shirt that read “Occupy Mars,” Musk began hopping up and down — thus launching countless memes — to show his enthusiasm for the man he’s backing in the election.

While Dodgers starter Yoshinobu Yamamoto warmed up, he was hopping up and down behind his team’s bench with his bat already in hand.