| Clue | Source | Date |
|---|---|---|
| Happy as _ | ||
| On — (just for fun) | Eugene Sheffer | 20 Jun 2023 |
| For fun, with 'on' | The Washington Post | 11 May 2018 |
| For fun, with "on" | LA Times Daily | 11 May 2018 |
| For fun, with "on" | ||
| On (for fun) | Eugene Sheffer | 25 Dec 2015 |
| On ___ (for fun) | Wall Street Journal | 30 Mar 2015 |
| Happy as -- | ||
| On ___ (for fun) | ||
| Happy as ___ | ||
| Happy as ___ | ||
| "Fresh as ___ . . . ": Wordsworth |