Here's our most recent installment of "Truth is Stranger Than Fiction":

Korean scientists think they have determined what caused a 39-story Seoul skyscraper to shake violently for 10 minutes, causing the building to be evacuated for two days.

Earthquake? Nope.

Gale-force winds? Sorry.

Volcanic activity? Unh-uh.

No, the culprit, they say, was 17-middle-aged gym rats working off the midriff bulge in a Tae Bo class.

Apparently, while dancing and boxing to "The Power" by Snap on July 5, the exercisers not only shook their booties, they shook the building.

Read more: http://www.sfgate.com/cgi-bin/blogs/hottopics/detail?entry_id=93459#ixzz1SfpAR13v