I used to be pretty casual about time keeping as a student, and was often late for class, or late for appointments - coffees and so on - with friends; once, I even missed a plane (my father, who had driven to the airport to collect me, - and had to do so a second time - quite rightly, was furious).
That began to change when I was a teacher (after all, the classes couldn't begin until I appeared), but now, my precise punctuality would almost make a German blush.
Ah! That's funny! I never missed a plane, but I missed many trains. I certainly missed more appointments than the Lord can count. I was always late for class too, which only enraged my teachers. This meme applies for my relationship with punctuality, responsibility, and my dad's multiple lectures. Obviously karma hit me back as now I have two kids that are not too dissimilar to me when I was their age, and curiously my reaction is similar to my dad's...

Now, I am never late to an appointment. Unless the car breaks down, or I fall sick, I do anything in my power to be near the location 10 minutes early. I might step in the meeting right on time, but I never arrive late to planned meetings.