Red blinking lights are generally bad.

There are a few exceptions to this rule. For example, the same progressive red lights on Kitt in Knight Rider were good, but bad on the Cylons in Battlestar Gallactica. For the most part, however, red blinking lights mean a bomb or an evil android. A recent episode of Terminator: The Sarah Connor Chronicles indicated that even those skilled at bomb detection and disarming (indeed, those charged with saving the world) can be fooled into thinking that something with a blinking red light is a bomb. It's a natural reaction. The lights are especially bad if they blink, but even a steady red light should indicate that there may be trouble ahead. If only Dave had heeded the red-light warning about Hal before it was too late.