Cat fit
Our indoors-only cat, Tippy, goes mad if she sees another cat through a window. She yowls and rages, scratches the glass and can't be calmed down.
Two nights ago one of the teens tried to shoo her from a window as she was carrying on and she turned on him, chasing him through the house and attacking his feet! He was unnerved enough to leap over and hide behind his dad who, unfortunately, was napping on the sofa and bore the brunt of a furious feline pounce on the head. (No serious harm done and we wish we had it on video.
)
Tippy paced about the room growling and hissing for some time with her tail fluffed out to triple its size. I guess we won't try introducing another cat anytime soon.