You weigh less when there is a full moon
For the physics inclined: he earth-moon (centre-to-centre) distance is about 30*Earth’s diameter, and so about 60* Earth’s radius.
So standing on the Earth’s surface you’re about 59 Earth radii (R) from the centre of the moon.
The lunar mass is about 0.0123 Earths
Your weight on the earth’s surface is given by Fearth = G * myou * mearth / R2
The force of the moon pulling up if it’s right above you is
Fmoon = G * myou * 0.0123 * mearth / (59R)2
Fmoon=0.0123 / 59R2 * Fearth
= About three parts in one million of your “normal” weight
For those who don’t like physics.. it’s due to the gravitational force due to the distance (radius) between the Earth and the Moon because in full moons, the radii is shorter.