Go ahead and try it: Go to the beach, walk into the ocean (or some nearby lake) and keep walking till the water passes over your head!
Can’t do it! Won’t work! Not unless you’re wearing some very heavy lead shoes or a scuba weight belt. Buoyancy will tip you over and you will soon find yourself swimming. Or at least waving your arms like mad.
Besides, any RATIONAL person trying to walk ON water (ok, that’s silly: rational people don’t do that) would probably soon realize that something’s not quite working when he gets knee-deep into the water.
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