Too many assholes are purposely late as a power play. We had one person that did it Every. Fucking. Time. Finally my commander was gone so I was leading the meeting. This was in Korea with people from the US, and local Korean managers, including the president of their corporation. I made sure that we started on the dot. When he/she waltzed in 15 minutes late they were shocked that the meeting had started without them. They tried to cover by saying, " I really am important." To which I said, "That's not true. We give important people clocks." The room ROARED with laughter. They were never late again.