Another cat magnet is the everyday flying insect.  Last nite a dragonfly got in my backdoor and my cats went nuts.  It finally settled on flying around my den with an army of cats patrolling underneath.  Cherokee was the most affected by it, standing on her hind legs on a desk and pawing at the air while mewling (I should add that none of our cats is very vocal, when they meow, it's unusual.)  She ran everywhere trying to find a way up to get the thing, but nothing was high enough for her to reach.