In 'How I Met Your Mother', who is the narrator telling the story to his kids?

In 'The Big Bang Theory', in which city do the characters live? In 'The Big Bang Theory', which character says "Bazinga!"? Who played Sheldon Cooper in 'The Big Bang Theory'? Which 'The Big Bang Theory' spin-off follows Sheldon's childhood in Texas? In 'How I Met Your Mother', which character's catchphrase is "Legendary"? Who played Barney Stinson in 'How I Met Your Mother'? In 'Parks and Recreation', in which fictional Indiana town is the show set? Who played Leslie Knope in 'Parks and Recreation'?