June 23 (UPI) -- Attendees at a high school graduation on New York's Long Island were left seeing double when 15 sets of twins walked across the stage to accept their diplomas.

The Class of 2025 at Plainview-Old Bethpage John F. Kennedy High School walked across the graduation stage Saturday, and among them were 15 sets of twins.

Some of the students said they didn't even notice the unusually high number of twins until some mothers started noticing.

"We are friends with a lot of them, but we never counted until our mom and a few of the other twin moms took a count," twin Chloe Manzo told Greater Long Island. "We were like, 'What?'"

Principal Heather Dvorak said the school previously saw nine sets of twins and one set of triplets graduate together in 2014.