CANCER (June 21-July 22): Here's a really cool prank to pull on April Fool’s Day: Have rubber tires airlifted in a dormant volcano, then set them on fire. Smoke will pour out the top. All who live nearby will think the volcano's going to explode. Videotape it for Youtube. When you reveal the hoax, the video will go viral and you’ll be a celebrity. APRIL FOOL! I don’t think you should try this. It’s old hat. Back in 1974, Porky Bickar did it to Alaska’s Mt. Edgecumbe. My real oracle: It's a good time to boost visibility by doing something funny. Or build your brand by being mischievous. Or demonstrate power by showing off a sense of humor.