You might not have seen To Have and Have Not – a romantic thriller from 1944 in which Humphrey Bogart and Lauren Bacall smoulder over each other for 90 minutes – but you’ll know its most famous scene. It starts with the pair trading barbs until Bacall suddenly leans in and kisses Bogart. “What’d you do that for?” Bogart says, a dumb smile across his face. “I’ve been wondering whether I’d like...