Whenever I misbehaved (usually involving unpleasant behaviour towards my younger brother) my parents would do the same back to me so that I knew how it felt. Obviously not hard, being small and fragile, but enough to get the message across. I remember one time my dad sat on my head, and I turned out alrightalrightalrightalrightghtghtght.
Still, it doesn't take much imagination to come up with non-corporal punishments that are equally or more effective than slapping. You can always tell which families are not imaginative enough- they're the ones with the screaming kids 24/7.
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