This right here is a neon light that's been turned on for the past 77 years inside of a wall in Los Angeles restaurant Clifton's Cafeteria. No big deal, it just might be the longest burning neon light in existence. (Normal neon lights last about 40 years, apparently.) Also, owner Andrew Meieran had no idea it was there until recent renovations uncovered it in a women's restroom; he estimates the electric bill to keep it on has cost about $17,000 over the years.
There are no current plans to remove the light; Meieran is going to leave it on display behind plastic. Here's a local news report:
Video: Light on For 77 Years at Clifton's Cafeteria