CWmike writes to share a recent manners-rant that has some great gems about how not to be "that guy" on a cell phone. What rules of engagement are absolutely necessary and what social penalties should become standard practice for repeat offenders? "It's easy to be rude with a cell phone. A visitor from another planet might conclude that rudeness is a cell phone's main purpose. Random, annoying ring tones go off unexpectedly. People talk too loudly on cell phones in public because of the challenge of holding a conversation in a noisy environment with someone who's not present. Cell phones need their own rules of etiquette, or we'll descend into social barbarism."