(NYDAILYNEWS) — High-school seniors were banned from graduation after releasing 10,000 crickets into its halls as a prank.

East Carter High School in Grayson, Ky., stopped seven students from attending Saturday morning’s celebration because of the cost of the cleanup.

Principal Larry Kiser said the creepy critters were still hiding in nooks and crannies several days later — which meant costly exterminators, had to be called in.

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