My Partially Complete Anti-Gravity Particle Hypothesis:

One night, while trying to fall asleep, I stumbled upon the Anti-Gravity Particle Hypothesis. Basically, there is no "gravitational force" or "pull", but instead an "anti-gravitational push." So, there are some kind of particles flying through space that bump into matter and push it. Then the anti-gravity particle either reflects back from whence it came, disappears, or does something else. The reason why we happen to fall towards large objects, (the Earth, for example,) is because the large object blocks the anti-gravity particles coming from behind it. The larger an object, the more anti-gravity particles it blocks. Thus, the anti-gravity particles pushing you towards the object overcome the fewer anti-gravity particles coming through the object. Therefore, the anti-gravity particles must be rather small so they are not very likely to collide with matter, but do have a good change. Likewise, they would be either highly energetic to produce enough push, or there would have to be a significant, and constant supply of them.

Applications to Density:
This theory also helps explain why less dense objects "float." The less-dense an object is, the less likely it is for an anti-gravity particle is to hit it. A denser object, then is more likely to have an anti-gravity particle collide with it. The less-dense object then has less "downward push" than the denser object, and therefore, the object's push is overpowered by the denser object.

Other Applications:
As far as I can tell, my Anti-Gravity Particle Hypothesis is not easily provable, nor disprovable, and reacts similarly to current gravity models/theories/hypotheses.

Clarifications:
Please email me. Also beware that this entry is incomplete [[note to self: add distance/force relationship, geothermal energy source, orbits?, inter/intra-molecular, that one other thing I can't remember right now, and other applications. Also, find if any similar, pre-existing theories/hypotheses exist.]]

Am I Joking?:
No, I don't think I am.