If somebody calls you six times, you call them back, Robert De Niro scolded Jay-Z, the Post reported, at Leonardo DiCaprio’s $3 million November birthday party. (The rapper had agreed to record a song to promote the Tribeca Film Festival, then went AWOL.) It doesn’t matter who you are, that is just rude.
28. Because Ellen Grossman can make small talk with a stranger on the subway, find out who the stranger is, end up on YouTube, and have the city fall in love with her.