You could walk on mercury.

liquid_mercury
Element mercury (Hg), liquid form. By an unknown author cc3.0

Mercury is the only element that is liquid at room temperature and at room temperature, it has a density of 13.5 grams per cubic centimeter. The human body has a density of only 1 gram per cubic centimeter so you and anyone else would float on top of a pool of mercury. So would cannonballs and lead bullets, but not gold, which can be dissolved by mercury.

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