pull it out
When a car gets stuck in the mud, two things are at work. First of all the mud is very slick. The tires of the car have no traction and simply spin helplessly trying to move the heavy weight of the car. Secondly, mud, if it is deep, has suction. It literally sucks the car's tires, holding the car in the mud. Combine this with mud's slickness and your car is literally stuck.
More
You can find ways to avoid getting your car stuck in the mud online at the WikiHow website. As a general rule it is best to avoid off-roading with your vehicle unless it is capable of handling it.
Matthew's dog was stuck in the mud.
The absolute safest way to get a car out of a muddy ditch would be to call a professional tow truck driver to help. If this is not possible then once a chain is hooked up between the car stuck in the mud and the car pulling them out make sure everyone is clear so the possibility of injury is decreased.
There are a couple of options, depending on the degree to which the car is stuck. It sometimes helps to place long boards under the tires where the drive is. A flat, dry surface will allow the tires to get some traction and drive up onto dryer ground. The other option is to have the car pulled out of the mud by a wrecker or tow truck.
It is better to have more friction when stuck in mud or snow, so that you can more easily get un-stuck.
mud
My foot got stuck in the mud!Gerson
Hold a weight steady in your hand. Push a broken-down car that is stuck in the mud.
Atascado - stuck in something. Can't move. My car is stuck. I am stuck in the mud. Atrapado - stuck in one place (Literally "trapped"), I'm stuck in the house and can't leave. Pegado - Stuck to something. The paper is stuck (taped) to the wall. Pillado - Mentally stuck and unable to think quickly (being caught in a lie).
A kangaroo could get stuck in mud, especially if it was bounding along at high speed and landed in a muddy swamp.