Engaging the attention; exciting, or adapted to excite, interest, curiosity, or emotion; as, an interesting story; interesting news.
arousing or holding the attention
Guidebook speak for puzzling, often extremely so. The reverse applies for spectators. Sometimes (sloppily) used interchangeably with exciting, so beware. [Tony Buckley
"Interesting" was the fifth episode of British sitcom The Young Ones. It was written by Ben Elton, Rik Mayall and Lise Mayer, and directed by Paul Jackson. It was first aired on BBC2 on 7 December 1982.
X's proof is interesting: I don't understand it.
a format variables -ASP