THE BATTLE CREEK VIBRATORY CHAIR What the hell was it? A spasmodic seat that shook the sitter violently-until he relented and stood up. Conceived by Corn Flakes creator and bowel redeemer John Harvey Kellogg, this one was featured at his Michigan sanitarium. Debut: Circa 1900 The promise: Being shaken, not stirred, will stimulate intestinal contractions and, therefore, leave you with a cleaner colon. Our verdict: Sitters surely felt like Wile E. Coyote on "ACME Earthquake Pills." Reminds us of English nannies and baby-shaking scandals. "You might as well have sat on a hansom cab over a back-country road," says Seabourne.