"Glitch," he told her merrily. "On account of the, well, glitching." Here, he touched the zipper on his head, pulling a bit on the zipper mechanism itself to show her. The zipper bisected the top of his head, with the mechanism on the back. Feeling it, he realized suddenly that it had come partly open.

"Oh, excuse me!" he muttered, properly abashed, as he took a minute to close it completely.

"Are you new here, Donna?" It was a polite enough question. "I've been here for ages myself -- or a few days. I can never seem to remember which."