The One with Rachel the Cat

Why do cats do the things they do?
Rachel likes to go behind the blinds and bask in the sun, then when she get too hot she rolls her fat self over and brings two or three of the partitions with her and stays in that position for a half hour or so.
She also likes to perch herself on the windowsill and stare outside; watching and waiting for me to get home.
Usually she rests both of her arms on the windowsill so she looks very "official" and "important."
I don't remember where I found this picture on the internet, but it looks just like Rachel, only much fatter and we haven't gotten her to do this trick yet.
Edited to add: Just minutes after I posted this last entry, Rachel went and did her other funny thing so I had to take more pictures. She likes to straddle the armrest of our couch. Both arms and both legs are wrapped around it. Check out the expression on her face, she's saying, "What? What did I do? Are you looking at me? Why are you looking at me? Do I amuse you?" Too funny.