Test your How I Met Your Mother knowledge with the largest collection of How I Met Your Mother trivia online. Answer trivia questions about your favorite episodes and How I Met Your Mother characters and actors including Ted Mosby (Josh Radnor), Marshall Eriksen (Jason Segel), Barney Stinson (Neil Patrick Harris), Lily Aldrin (Alyson Hannigan), and Robin Scherbatsky (Cobie Smulders).