My GF loves cats and seems bent on getting another one.
The last expierience I had with cats was when I was a child. This outdoor cat used to stop by the backdoor and paw at the screen a bit. My mother, cat lover she is, used to let him in and give him food and water. He enjoyed this and kinda became our pet. One day, we let him in after he knocked. Thinking nothing of it, we went about whatever we were doing that day. The TV, however had been removed and sent for repair. The cat took one look at the empty space where the TV was, turned around and raised his tail and pee'd all over the wall. As if this weren't bad enough, he ran off up the stairs and hid in a closet when my mother tried to catch him. The little monster stayed there for two hours before he came out and was summarily dismissed.
No cats ever again in that house. GF wants when, but Guinness the super beagle will probably take issue with that. Thankfully, he was here first and kittah won't stay long if it doesn't get along with mah beagle buddy.