Which quick eye signal, made by briefly closing just one eye, often hints at a shared joke or secret?

Which reality TV couple starred in a TLC show, launched in 2007, whose title added "Plus 8" to their names? Which California city's ZIP code became part of the title of a 1990 Fox teen drama? Which singer fronted the Comets, the band behind the 1954 hit "Rock Around the Clock"? The island of Nevis forms a two-island Caribbean nation together with which island? What nickname did keyboardist Daryl Dragon use in his 1970s pop duo with his wife, Toni Tennille? Eric Clapton recorded "Layla" in 1970 with a band whose name paired the Dominos with which male name? Which rock singer is backed by the E Street Band? Which singer led the Heartbreakers, whose hits included "American Girl" and "Refugee"?