I've been having ongoing adventures in old plumbing for the last few days.

First, I arrived home from my century on Wed and my wife informs me that the kitchen sink (a hands-free, motion detection jobber) isn't doing anything. I eventually get that problem fixed, but during the troubleshooting process, I had to turn the water off and on at the valves under the sink, and one of the valves decides that it's too old and has had enough of this crap, and it develops a slow leak. I address that next day, replacing both valves - done and done!

Nope - the day after that, I notice a drip in the basement. I check all of the connections under the sink, and they're all nice and dry. Go back to the basement to locate the drip - it's coming from the shut-off valve just under the kitchen, which I had to use to shut off the lines when I replaced the valves in the sink cabinet that failed when I was troubleshooting the faucet.

I just picked up the replacement valve for the basement, but if a leak develops at the water main valve, which is the next and only valve up the line from the one I'm now replacing, I'm going to be very not happy.