For a long time mankind thought the worst kind of wasted time was the refuel. The fuel filler is introduced into the tank and you can do nothing but standing around the car and operate the trigger of the hose. Then one creative and wise man invented a deduction tap at the end of the tank snap. Since then people can scrape insects from the windshield or collect coke cans from the fund of the car while the gasoline is running into the tank. Thus, the worst kind of wasted time would clearly be a slow internet connection. Scourge of mankind.