Rugrats was one of my little sister's favorite cartoons. I watched it with her because I was a nice older brother and because it was awesome.
Nickelodeon also had some really wierd but great cartoons. The Ren & Stimpy Show is probably the best example, but Rocko's Modern Life was also quite strange.
Then there was the kid that wore that killer sweater vest & shorts combo every day and had a friend with green skin.
Now all I have to do is figure out what Nickelodeon stands for...