i was looking at a hey Arnold episode on YouTube (click here to see it) and at 6:49 i realized in the sean when they are in the comic book shop there was a comic book and the title was *spongebob* and that episode was shown before the very first spongbob episode was shown( in may 1st 1999)
i took a picure
you may not see it so click it to see it larger
(P.S you may be wondering what hey arnold is. it is a show on nickoloden that id discontinueing. i used to watch it when i was 4. but i really missed it)
