before stackoverflow there was expertsexchange.com and they were forced to add a hyphen to the name because people kept making fun of the expertSEXchange, it became experts-exchange.com
Wow, I probably haven't logged into EE into 20 years. I just tried now and somehow guessed my username and 5 letter password first time. They want $9.99 to let me in, though, but they claim to have all my achievements still...