Don't worry if you don't get it - that's the point - if there was one...
Two mice in a bath tub.
One mouse politely asked the other: "Would you mind handing me the soap?"
To which it got the reply: "What do I look like to you? A bloody typewriter?!"
Two cows on a hill.
One tripped and fell, rolling all the way down the hill. It got up and expressed: "Mooooh!!!!"
The second cow promptly commmented: "Damn you! That's what I wanted to say!"
Two balloons in a dessert.
One balloon noted to the other: "How about them Sox?"
The other, slightly startled: "What cactussssssss?"