| Clue | Source | Date |
|---|---|---|
| 'I'm not kidding!' | USA Today | 01 Aug 2021 |
| 'I know it sounds weird, but it's true!' | ||
| 'Seriously!' | ||
| "Seriously!" | LA Times Daily | 27 Jan 2019 |
| "Seriously!" | ||
| 'I'm being serious!' | Wall Street Journal | 27 Jan 2018 |
| 'Honest, it's true!' | ||
| "Honest, it's true!" | LA Times Daily | 01 Aug 2017 |
| "Honest, it's true!" | ||
| "I'm serious!" | ||
| Sarcastic reply to the obvious | ||
| "Seriously!" | ||
| Response to a disbeliever | ||
| "I don't believe that" | ||
| "I'm serious!" | ||
| "I don't believe that" | ||
| "I mean it!" |