I'm obviously being thick, or uncool, as I have no idea what's funny about this. Zinsser is the leading maker of paints for difficult situations, such as stain blocking, or unstable surfaces. I've just used 2.5 litres of 1-2-3+ to stop the stain in some tacky sapele veneered doors leaching into the paint I'm applying.
To me, your comment is a bit like "Hey, did you know there is a car maker called Honda". Other opinions are of course available...