| Clue | Source | Date |
|---|---|---|
| "Is that so?" | USA Today | 01 Mar 2024 |
| 'Is that so?' | New York Times | 02 Mar 2023 |
| 'That a fact?' | New York Times | 22 Oct 2022 |
| "Is that so?!" | Universal | 30 Dec 2021 |
| 'Is that so?' | USA Today | 04 Sep 2020 |
| 'You sure about that?' | New York Times | 31 May 2019 |
| "You sure about that?" | ||
| 'That so?!' | New York Times | 12 Jul 2017 |
| "That so?!" | ||
| 'Is that so?' | Eugene Sheffer | 11 Aug 2016 |
| "You don't say!" | ||
| "Is that so?" | ||
| "Yeah?" | ||
| Skeptic's comment | ||
| "Is that so?" | ||
| "How interesting" | ||
| "You don't say!" | ||
| "No kidding!" | ||
| "Is that so?" | ||
| "Is that a fact?" |