Jumpin' Jehosaphat!

 

When I was a teenager growing up in Toronto, a friend's older brother owned a high-end stereo shop on Spadina Avenue called Ring Audio.  As a promotion, he bought a bunch of these discs and had his circular logo printed on one side.  (This has now long worn off.)  The discs work really well.  Hours of entertainment if you were in a certain state of mind. (I just discovered that Ring Audio is still around, now servicing "vintage" equipment.  I feel old.)