It’s the type of situation that’s inspired thousands of bad romantic comedies: A loving couple buys a lottery ticket as a goof, their ticket ends up being a winner, the couple fights over who owns the ticket and moviegoer demands their $10 back when people behind them won’t shut up. In the case of Deanna Rigg, 34, and Michael Karoli, 43, of La Grange, the ticket they purchased at their neighborhood gas station yielded a $70,000 payoff after taxes.