What TV comedy famously coined the holiday term "Festivus"?

Seinfeld

What classic horror film includes a character named Norman Bates? Which part of your body has taste buds to let you taste food? Which bounty hunter wore Mandalorian armor, apart from Boba Fett, in the Original Trilogy? What brand of jeans does Rachel claim Ross wears unstylishly? Who designed and built America's first successful steamboat called "Clermont"?