Answer:
These are believed to be found at the end of rainbows
Spies and detectives do this to phones and musical shoes make this sound.
What occurs once in a minute, twice in a moment and never in one thousand years?
You'll have to consult an optometrist if you want to improve this.
Whipping one of these out in the wrong setting is said to be terrible luck.
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?