1. Nickelodeon Gak
Of course this made it to the #1 spot. It's goo toy perfection. Plastic-scented, eternally entertaining, and available in stunning variety (Solar Gak, Smell My Gak, Metallic Gak), it was the defining muck of my childhood, as I'm sure it was yours. My sources tell me "Gak" is slang for cocaine, which gave its creators at the Nick-labs quite a chuckle, but I refuse to taint my Gak-coated memories in any way. Gak will always stay golden, at least in my mind.
Wil Fulton is a staff writer for Supercompressor. He wouldn't trade his goo-filled childhood for all the Gak in the world. Wait, yes he would, actually. Follow him @WilFulton.