Every now and then even my Mac bugs me. For some so far (to me) unknown reason Spotlight hogged the CPU the other day. CPU usage was permanently above 150%, as reported by Activity Monitor. After a while that otherwise silent thing turned into a jet plane ready to take off. That's what fans at 6000rpm sound like. Plus the hard disk was grinding away so the machine was barely usable.
Googling did not really reveal anything except an article that gave me a hint that I still have to investigate: maybe Spotlight got stuck on a file. Although I think a grinding hard disk is evidence that Spotlight is not exactly stuck. Smells like some kind of endless loop, rather, and not one on a single file.
Anyways, the only quick way out of it was disabling Spotlight altogether. Great.