 Cats and especially kittens can be very playful and energetic. Sometimes they expel all that energy by darting from room to room, jumping up and down on the furniture, and going a little crazy. This kind of behavior can also be a reaction to catnip, which can make cats act goofy for short periods of time. Your cat might be acting weird because he or she is feeling the stress, too. Since cats are sensitive creatures, it is not uncommon for a cat to feed off of his or her owner's stress. Even the slightest amount of change, in a cat's environment, can disrupt his or her mood.