Willie-O: "Consider: gravity itself is a very weak force. You have to be the size of a planet to have any notable amount of it. The tides are a subset of gravity, which only occur due to a lack of resistance from any other force--the moon after all has a whole planetary ocean to work on.People are a lot smaller than oceans. I don't think people are tidal."

I am not the size of a planet, nor even a moon, but I have yet to fall of the Earth. The force of gravity is relative to the sum of the two masses on which it is working*. i.e. the sum of the moon's mass and the mass of the body on which its effect is being considered.

Nigel
*(and inversely proportional to the square of the distance between then)