I don't know if these infomercials were seen in other countries, but in the US, in the late '70s, a cultural icon was made.
The Ginsu knife commercials. "It cuts through this can, saws through this brick and STILL is razor sharp and slices through this tomato without a drop!"
"NEVER needs sharpening!"
"How much would YOU pay?"
"BUT WAIT!! THERE'S MORE!!!"
Ok. My mom gave me one of these Ginsu knives as a gag gift just before I headed to college--30 years ago!

I have to hand it to them, this knife has been outstanding. It is used daily and has sawn through frozen meat (and its paper/plastic/styrofoam packaging), cut vegetables, and sliced bread flawlessly---and has never been sharpened!
It is a serrated blade which is sharpened (? beveled grind?) on both sides.

Going to wikipedia, here's a little blurb about this miracle blade:
Ed Valenti and Barry Becher, founders of the Rhode Island based direct marketing agency Dial Media, found a set of knives made in Fremont, Ohio by the Douglas Quikut Division of Scott Fetzer. Originally called Eversharp, Valenti and Becher decided that they had to come up with a more alluring name before the product could become a true success and catch on in mainstream media.
The original commercial:
For those who care, this original Ginsu knife was made in America, (Ohio), and was made of "surgical stainless steel"
Kudos! to the Original Ginsu!

