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All was quiet in 6 Resilience classroom, save for the whirring of the smart fans. The students wore looks of dread on their haggard faces. Their movements were sluggish, as if they had already been chided by various teachers for their lackluster attitude toward PSLE. However, it seemed that Mr Heng would do something unusual today. As he played “Waka Waka (This Time for Africa)”, the students looked at him quizzically. Their eyebrows raised, they lowered their jaws, wondering if their English teacher had gone berserk.

State an adjective to describe how the students felt when Mr Heng played “Waka Waka (This Time for Africa)”. Support your answer with evidence from the text.