This is a box (styled to look like it could have come out of an electronic music studio in the 60s) which houses two oscillators and a ring-modulator.

Circuit Bent Talk and Learn Toy (Listen)
Like most circuit bends this produces all kinds of random things. The knob acts as pitch control and the red button activates the 'glitch'.
A circuit bent guitar toy (Listen)
Another kids toy with two 'skew' knobs on it.

Bird Box (Listen)
This is a kid's sound maker (mostly animal noises) ripped up and rehoused in a wooden box. Two banks of nine sounds activated by pressing the pins with the stylus on the end of the wire and a pitch control.
Circuit Bent Duck Toy (Listen) (Listen)
Circuit bends are unpredictable and this one plays 'Old McDonald' at the most inopportune moments. When the pitch is turned down really low it produces wonderful random low pulses.