| Goof |
| Gaffe |
| Error |
| Boner |
| SLIPUP |
| Foozle |
| Blunder |
| Boo-boo |
| Howler. |
| Slip-up |
| Clinker |
| Slip ___ |
| Foul (up) |
| Oopsy!" evoker |
| Eraser's target |
| Oops!" prompter |
| It may be costly |
| Example of fallibility |
| An "X" may signify one |
| 2 + 2 = 5, for instance. |
| Happy accident," so to speak |
| Part 7 of a Stephen Leacock quote |
| Man is Nature's sole ___!": Gilbert |