You can be guaranteed it will never happen when you're in no hurry, but when you need to get somewhere quickly it does. Traffic lights turning red.
This is a typical story of traffic lights doing their thing when I was on the way into work one day. The first set of traffic lights at the end of the village - turned red as I was coming up to them. The next set in Wishaw (where I usually park), red again. The next set of traffic lights at a small pedestrian crossing, red. The next set, a few hundred yards on, red again. Four for four, what a way to start the day!
By the time a fifth set of lights stopped me I was finding my lack of fortune to be a bit frustrating. Thinking ahead to avoid another set of lights and a roundabout where there are always delays I took a back street to cut them out of my route. Guess what? No, not traffic lights. No, instead I was greeted by a reversing trailor full of Land Rovers.
I'm not sure quite how I managed to be in work on time that day, but I did. And it is probably only because I did that I can tell the story with a smile, albeit a rueful one.
Have a good week!