If the metric system did ever become universal, there would be some really messed up expressions to deal with:
* A miss is as good as 1.1 kilometers.
* Put your best 0.3 of a meter forward.
* Spare the 5.03 meters and spoil the child.
* Twenty-eight grams of prevention is worth 453 grams of cure.
* Give a man 2.5 centimeters and he'll take 1.06 kilometers.
* Peter Piper picked 8.8 liters of pickled peppers.