Wendy suggests the possibility that the blackboard in this room may have shattered due to a sonic boom.[1]

In aerospace engineering, a sonic boom is the sound that an aircraft, spacecraft or anything else makes when it flies or moves faster than the speed of sound.

Wendy Harris speculated that a sonic boom may have been what caused the blackboards in Marvin White's classroom to shatter. Batman also thought that could be possible, even though he wasn't convinced it was the cause.[2]


  1. As seen in The Ultra Beam.
  2. As seen in the Season 1 episode The Ultra Beam. (1973)

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