Tuck a fishbowl into a gutted pumpkin, and fill with bottled drinking water (not tap water from the faucet, distilled, or deionized water). Find creative props at the pet store. This tiny gravestone is perfect. Paint smaller pumpkins black, and stack them up to create a cat. Scrape away flesh to create eyes, and use discarded pieces of the orange pumpkin to make ears. Your fish friends will be purr-fectly frightened. Note: Replace about 20%of the water in your fishbowl with fresh bottled drinking water twice a week. As a bonus, the discarded water is great for plants. Avoid placing the bowl in direct sunlight, and move it indoors if the temperature dips below 65°.