A fail and a successful deployment of anti-fail countermeasures

My glasses disintegrated a bit this morning just before I was going to leave for work - one of the lenses fell out because a screw came loose. Eek. Luckily this happened just next to where I happen to keep a glasses repair kit that I happened to buy in Tescos some time ago and I happened to remember where I had put it, so I mended them with no problem. :-)