I recently got several new Victorinox knifes, they really are great quality. When I was very young and very stupid we tried to deliberately break the blade on one but failed, it probably can be done but it survived a lot of abuse. I conjecture the most common failure mode is having it stolen or forgetting it somewhere (or confiscated by airport security).
I agree with this. My most prized possession at one point as a child was a Victorinox pen-knife that had EVERYTHING, eyeglass, rule, drivers, scissors, can opener, the lot. The electrician had left it behind and I figured "Finders Keepers" as he left it so long... and nobody noticed...
Unfortunately my mum found me showing it off to all the kids and strangely enough the electrician turned up soon after claiming he left a tool behind, and I had to sheepishly give it up
Oh actually I remember another one around the same time - A continental lorry driver overturned his truck and all the police were out in force at the accident scene. I spotted amongst the truckers debris a very nice locking switchblade, which happens to carry an absurd mandatory sentence for carrying in the UK (I didn't know that when I was 10). I purloined it and sadly a copper spotted me and got it back. While the trucker probably got prosecuted for falling asleep at the wheel, he probably ended up in prison for 5 years for having the perfectly reasonable safety locking blade in his kit of tools at the time and it having no bearing on the accident whatsoever.
Sadly all the really good multi-tools will have locking blades, but a perverse lacuna in the UK knife law is that makes them illegal.