Why must we put on our pants one leg at a time?
If we jumped into our pants simultaneously placing both legs in at one time, we would land heavily on the ground. As a majority of us are getting dressed at the same time of the morning, the cumulative effect would Cause an earth tremor. Due to the use of time zones, the tremor established In Eastern Time would arrive in the central zone at precisely the moment all those people were jumping into their pants. The tremor would increase in size exponentially, and proceed west to combine with the mountain zone folks as they get dressed. As this cycle encircles the globe, it would feed upon the next day's Tremor and eventually cause the earth's crust to break apart and float into space. This is why we put our pants on one leg at a time. :-D!
That is also why skirts were invented. However this plan nearly failed after it was found that the tight skirts made the girls jump while wearing them thus defeating their purpose. To work around this problem skirts are now made shorter to maintain the stability of the earths crust. As population increases the length has to be continually decreased to keep everything in balance. Scientists are "closely" monitoring the situation.