The Goosebumps series by R.L. Stine!
Probably wouldn't be all that scary in retrospect, but I still remember a plotline where two people accidentally switched bodies and couldn't get back. (I'm now realizing that Freaky Friday is a horrifying concept.) And there were like 14,000 of them so there was always another way to terrify yourself.
(Image: 90s Rocks)
Another hilarious concept, as these pencils were SO ANNOYING to use. The erasers never worked right, and as soon as you tried to sharpen them, they didn't look awesome anymore. But like most things in the 90s, the fact that the concept was awesome was enough to keep us all begging our parents for more of them.
(Image: Retro Junk)
The best birth control method of the 90s. Started out as a fun way to take care of a digital creature, and then realized I couldn't make it shut up when I was taking a test in fourth grade and it was beeping in my desk and dying of too much poop and not enough love. And that's why kids shouldn't have babies.
Oregon Trail, the game.
Best. Thing. Ever. I don't care that there were later versions that were much more awesome. This game was the unequivocal best. And it also prepared you for the tragic realities of a long journey across the countries as you watched the characters you'd named after your best friends die off one after the other of dysentery. WHOMP WHOMP.
Let's get back to eating foods that hurt our bodies. Warheads were so sour that they literally used to burn little holes in my tongue. Every sour candy that I've tried since has left me craving the true sour-pain that only Warheads could give me. I guess that makes them the candy version of meth.
(Image: The Grrronicle)