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ST. LOUIS (KSDK) – Some Metrolink riders were caught with their pants down Tuesday night.

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The fourth annual "No-Pants Metrolink Ride" was hosted by St. Louis Improv Anywhere.

Riders boarded the train (sans pants!) at the Skinker Station, and rode to the Scottrade Center, before getting off at the Convention Center for an after-party at Pi Pizza.

This year, the group added a new twist to the ride: They asked people to part with their pants during the ride, rather than before boarding!