WATCH: What happens when somebody OD's on 'bath salts'?

(CNN) The man is strapped onto a gurney and restrained, yet he is singing, making faces and twitching.

"You know where you're at?" a paramedic asks him, but Freddy Sharp can't answer. He was, he explained later, off in his own world after overdosing on synthetic drugs known as "bath salts."

"I'd never experienced anything like that," Sharp told CNN's Don Lemon. "It really actually scared me pretty bad."

Read more: CNN