The floor on the back pasenger side of my car is completely soaked, it looks like someone took a hose and left it running in there for a few minutes.. Anyone know what the problem might be?

I'll guess the rear window is leaking. Check the trunk for signs of water. Other than that wait until it drys and try hoseing down a window at a time. Also check the door seals and sunroof (if you have one).

I had this happen one time, couldnt figure it out, its gonna be wet for a week or so, or you can dry vac it.

..I peed in someones open window once...but they deserved it

There are no water spots anywhere on the leather seats or anything, so I don't think it's the sunroof, or the window..

rent a carpet shampoo cleaner vaccume and suck up the water.

After the car wash one day I notice a bit of water dripping from the headliner in the back, I needed a new seal around the top corner of the rear window(not door windows).

If you have a sunroof the drains might be clogged. There should be 4 of them. One in each corner. You can see them when the sunroof is open. there are tubes that run down the a and c pillars to drain the water at each corner of the car. You can pour water in them to make sure there draininmg properly.

this haoppened to me in my old car and i couldnt figure out what haoppened so i cleaned it up and all and couple days later it came back and this went on and on and the car smelled so bad LOL

The water could be coming from below if you have a rusted or damaged area at the rear wheelwell. When you drive through standing water, the tires spray the water against the wheelwell. A very small hole will allow a lot of water to get in when you are driving in the rain. Good luck finding the source of the water and let us know when you figure it out.

Thanks a lot for everyone who helped. I haven't had any time to even check anything because I've been so busy, but I'll try everything mentioned when I get some free time.

Thanks again
-Chris