Another one of my unfinished sentences and responses it received in April 1992:
Predictability is most welcome (or unwelcome) when...
...(welcome when) you've never had cavities and never will. (Candice J.)
...(welcome when) you receive and envelope from a place you applied to. The envelope is thick; you have the job. (James M.)
...(only welcome to me when) it provides a little stability to the more enjoyable unpredictability. (Paul H.)
...unwelcome when you know what you have to do, but the unexpected keeps pushing you back; welcome when it's the unexpected that actually thrusts you forward. (Karen B.)