2. Leonard reveals an indiscretion at the worst possible moment.
On the way to Vegas to elope, Leonard drops a bomb on Penny. Apparently, when he was on that research trip in the North Sea, there was a lot of drinking and craziness going on. And there was a girl! Leonard says they just kissed, and that it wasn’t even good–she was a smoker, he’d just been seasick–and promises that going forward his mouth will be for Penny and food only. But while she begrudgingly forgives him, she’s not exactly in a great mood. Still, when we leave them, they're still planning to get married. We'll see.