Apparently the P-trap that I bought, the nuts and compression fittings that came with it, and the old “waste pipe” and nut on it were all crap. When I assembled everything, there were leaks where the nuts and compression fittings held things together. We gave up and called someone who does this for [...]

I went to go remove the P-trap under the “blue bathroom” sink, to clear
out a clog and fix a slow drain. In the process of unscrewing the nut
(which appeared to be original ‘57), it disintegrated. [...]