Bottom of the Toy Box: Forgotten Relics of the '80s-'90s

[Skjay]

Jump ahead a few years here... The best shit of the 90s included

Those fuckin pens that did a whole bunch of shit
POGS
Yak-Bak
Those things where you pull the strings and it sends the ball back and forth between two people
Slip and Slides
Sockem Boppers
Annnd, the true reason I made this post:
Does anyone remember those things were like a collapsable plastic cup with some sort of electronical bullshit to make your voice sound distorted? What the fuck were those called?