Some tornado myths are remaining bits of folklore which are passed down by word of mouth. The idea that the southwest corner of a structure is the safest place in a tornado was first published in the 1800s and persisted until the 1990s despite being thoroughly debunked in the 1960s and 70s. One notable instance of mass media spreading a tornado myth was after the 1999 Oklahoma tornado outbreak, where TIME magazine ran a caption on a picture suggesting that highway overpasses were safer tornado shelters than houses. The spread of some myths can be attributed to popular tornado-themed movies such as "The Wizard of Oz" and "Twister".