get a bright idea meaning

• [American idiom]
  for a clever thought or idea to occur (to someone).
  • Now and then I get a bright idea.
  • John hardly ever gets a bright idea.
  • Listen here! I have a bright idea!
  

• a bright idea:    [American slang]a ...
• give someone a bright idea:    [American idiom]to ...
• get a rough idea:    [American idiom]to ...

Examples

1. If I get a bright idea late at night,
2. Woody gets a bright idea, grabs the roll of tape and holds it up.
3. She also mentions that Eddie left Lana, and not vice versa, and Frank gets a bright idea.
4. In the episode of Gets a Bright Idea ", Arnold's mischievous cousin Janet uses a Pepper's ghost illusion to convince the class a theater is haunted.