Static E!

Static E! is an attack used by several enemies in Super Mario RPG: Legend of the Seven Stars that causes a blue, shimmering wave to cover the screen and, along with an interesting sound effect, deals minor electrical damage to all targets.

Trivia

 * Static E! is a play off "static electricity".
 * In the Virtual Console version, the Static E! was altered to avoid potential seizures by removing the white flash, leaving it completely blue.