Only ever missed one flight: returning from Paris on my first ever overseas business trip. I asked the office whether I needed to book a cab from the hotel to CDG for the following morning, to be advised oh no need, just get on the RER, it only takes 30 mins. All the other visitors from HO just do that.
Of course, halfway to CDG and the train grinds to a halt and sits in the tunnel for an hour due to some industrial (in)action. I arrive just as the gate is closed and have to purchase a single ticket which, IIRC, was about twice the price of the original ticket.
I had extreme amounts of p!ss extracted back in the office for months after that.
Now I am at the other extreme, always always always far too early, and enjoy the free food and drink in the lounges!