What you feel when using your mundane ol' wheeled Powell Peralta after seeing da hovering Mattel models on "Back to the Future, Part 2".
In "The Secrets of the Back to the Future Trilogy (1991)", Kirk Cameron is regretful to not be able to cure fan-mail-writer Grady Cooper's boardom from his not being able to find a hoverboard at da sporting-goods store --- as Kirk smilingly explains, "Director Robert Zemeckis was only joking about hoverboards' being real."