We didn't have Cartoon Network in Canada, we had Teletoon. A lot of CN shows were aired on it, but so were a lot of non-CN shows (such as Duckman). I have great memories of sitting in my "Captian Kirk Chair", keyboard in my lap, killing it on IRC with "Teletoon At Night" and "teletoon Unleashed" playing in a window on my computer (I had an ATI All-In-Wonder TV tuner card so I could watch TV while surfing). The nighttime block featured shows such as Duckman, The Simpsons, Futurama, Cyber Six, Bob & Margaret, Ren and Stimpy, Space Ghost Coast to Coast, Harvey Birdman - Attorney At Law, Venture Brothers, Home Movies, Archer, Spawn, and more.
Eventually all of the adult programming was removed from Teletoon and a new channel, Adult Swim, was created (In Canada Adult Swim was a whole channel, not just a programming block of CN). Teletoon coasted along with kid & teen programming (such as Total Drama Island, Teen Titans Go!, etc) but it finally rebranded itself as Cartoon Network. It still focuses mainly on the kid's stuff though, and leaves the adult stuff to the Adult Swim channel.