CNN’s Jake Tapper appears to have found the source of President Donald Trump’s strange suggestion that Japanese auto manufacturers drop bowling balls onto the hoods of cars they’re testing to see if they are quality.

During a speech at a fundraiser in Missouri on Wednesday, the president touted the Japanese “bowling ball test” when discussing trade.

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“It’s the bowling ball test,” he told attendees at the Missouri event. “They take a bowling ball from 20 feet up in the air and drop it on the hood of the car.”

“If the hood dents, the car doesn’t qualify,” he said, before disparaging the “test” as “horrible.”

Though White House press secretary Sarah Huckabee Sanders said the president was “obviously” joking about the “creative” and “unfair” trade practices used by other countries “to keep American goods out of their markets.”

When researching to find out whether or not any example existed of the “bowling ball test,” Tapper said that his team was only able to find a single one — as a gag from an old segment from the Late Show when David Letterman was still hosting.

“It’s possible this is what [Trump] was referring to,” Tapper noted. “I don’t know.”

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Watch below, via CNN: