Related Clues:
- Some hope to keep laughing, not an uncommon thing
- Blue moon, for instance
- Fodder for Ripley's column
- Something very unusual
- Two-headed calf, for one
- Albino, for one
- David Bowie's 'Space ___'
- Find swimmer swigging it on closure of boozer
- A curiosity
- Entry for Ripley
- Weird - it is last healthy rare bird
- Unusual specimen
- Not even I try extremely rare thing
- Curiosity - one's mathematical quality?
- Something valued for its scarceness