Who knew a little late-night tweet from a customer would spark a chain of events that would turn a new Heights restaurant into the topic of international news stories? Here’s the basic outline of what went down over the weekend at Down House: Customer, after a few beers, sends out tweet about bar staff. Off-duty bar manager doesn’t like tweet, calls up bar and asks to speak to customer. After a brief exchange, customer is asked to leave. Queue . . . the TV news! The Huffington Post! Gizmodo! Time magazine! The Daily Mail!