Lesson in Programming on Western Railway - Don't add a feature till needed

I had to go to a formal meeting and dressed in a tie. The train in Borivli was crowded as usual but getting down at Bandra was worse than I expected.
The rush of people trying to get in made exiting a very difficult exercise. I got down but my tie got entangled. Fortunately, only my shirt and tie were twisted out of shape.
It was, but, a valuable lesson. After that, the tie was always in my pocket and not on my neck till I was out of the local train.
The habit became so strong that I try not to program even a line till it is needed.