The other day I needed to simply saw off a bit of plastic angle to cover up a bit of edge damage on a shelf, and noticed my trusty junior hacksaw had no blade. I found a packet of new ones which I'd purchased some time ago from a large DIY store, and my friend noticed that the pack said Lifetime guaranteed on it. I pondered this for a while and wondered if this completely meaningless phrase was still in use anywhere. I mean you would not say that about something like a candle, and obviously it could not be said to be of any meaning for a hacksaw blade ether? The first time I encountered this was on Scotch video tapes. I'm sure you recall the animated skeletons saying their tape had a lifetime guarantee. Lifetime of what? Its a bit like what you find on adverts for toothpaste and the like when they say Clinically proven and this is normally uttered by somebody in a white coat.
Back in the day of photographs, I'd often see films for your camera made by Kodak, suggesting you got more vibrant colours than with other films. Most of the variability, at least as far as I knew was down to the development and printing process.
Brian