When I went into the kitchen this morning to fix breakfast, I turned on
the cold water and got just a dribble.  My first thought, of course, was
that the pump had failed or tripped its breaker, so I went back into the
bedroom to put on some shoes, but realized that I really should check to
make sure it was a general rather than specific failure.  The water in the
bathroom worked perfectly.  Back in the kitchen, I found that the hot
water worked - it was just the cold that didn't.  After considering the
possible failures (plugged up pipe, broken faucet, etc.) I decided to
check the simplest, but least likely: the water being turned off at the
shutoff valve under the sink.  When I opened the cabinet, it was instantly
clear what had happened: a cat had knocked over the (heavy - it's nearly
full) bucket of dishwasher detergent which had fallen against the
unusually easy to turn valve handle which in turn had turned the water
almost completely off.  I guess I'm going to have to go back to
cat-proofing the cabinet doors.

Needless to say, that made me late for work, but it was OK - I was still
the first one there (highly unusual).