I think it's time that time went to the metric system. Distance is measured in meters, and other distances in multiples and submultiples of 10 (centimeters and kilometers). Temperature is as well. Water boils at 100 degrees Celcius and freezes at 0, and you have 100 degrees in between. Volume is the same. You have litres, millitres etc. Time, on the other hand, has weird units, like hours and minutes. How many hours in a day? If you were thinking metric, you'd expect a muliple, (or submultiple) of 10, but you'd be wrong. There are 24 hours in a day, and minutes and seconds are equally messed up. So, what I'm proposing, (just to keep everyone on their toes) is to introduce a new unit of time (equal to 24 hours) called the "Day". Minutes and seconds become obsolete, and you get millidays and centidays, kilodays etc.
How would this change life, you may ask? Well, instead of tv shows starting at 4:30, for example, they'd start at 0.6875 (because 4:30 is 16.5 hours into a day, I simply divided 16.5/24 to convert to metric.) You could still say, "4:30", and most people would know what you were talking about, but they'd shake their heads at your inability to let go of the past an embrace the future. The only problem with this (that I can think of) would be that, say, the United States refused to use metric time, and everyone else converted. Then figuring out what time Friends is on would require a calculator.