"Yeah, I think she might have been going for Sheldon, but he has fantastic dodging reflexes, so... Amy was the weaker antelope. It's the way of nature, Leonard; she is red in tooth and claw."

"Did you just cross the line?" he asked. His voice sounded like it had gone up an octave. "How would I know? I can't exactly see the line." She inched a little bit more.

“Leonard, your girlfriend is trying to kill us again,” she tells him solemnly.   “Yeah, I really need to talk to her about that sometime. It was fine at first, but now it’s just weird,” he says wryly, and Penny laughs.

He feels like he’s interrupting something personal, something that’s only going to remain a special memory for two, and in the back of his mind, he knows there’s no place for him here.

Penny gave her a broad smile and reached over to pat Sheldon's knee, asking him, "Do you want to play the elements name game? I've been studying in the shower."

And the days pass like receding waves, rolling over her, dragging her each hour a little farther from the shore.