I recently discovered why it's important to go into your house and explore every room from time to time.
Upon opening the door into my basement for the first time in a long time I noticed a loud dripping noise. Wondering if it was coming from the washing machine that was cycling through its rinse cycle I perked my ears and located that it was coming from the basement.
Normally I am loathe to go into the basement, it's infested with spiders and I hate those yucky things. Anyway braving the basement I noticed that one of my newly repaired pipe joints was leaking like a sieve and the drip had overflowed the bucket I had placed under it some 2 months ago. Who knows how long it had been dripping, probably less than a day or so, but if I hadn't by chance heard the dripping sound I would have flooded the basement and spend about a gazillion extra dollars in water usage - it was the hot water line too!
I guess the lesson for me is to overcome my fear of spiders, clean the basement, and start exploring my house regularly.