Whistling worked best, she was finding out. It threw people off balance, and you couldn't tell if the person was a guy or a girl. Some people, if they knew what gender was coming up behind them, knew whether they should stand their ground, run away, or run toward them.

Plus, this got the other person to reveal themselves quicker. Because now Cindy knew it was a girl. "Not a doki-doki, I can tell you that," She called out, continuing to move close, albeit a little more slowly. "Who're you?"