| 100% | TEACH | 5 | What those who can't do do, or so they say |
| 57% | FLAKE | 5 | Person who can't be counted on to do what they say they will |
| 52% | HANKAARON | 9 | MLB great who said, "Play so good they can't remember what color you were before the season started" |
| 51% | ATTRACT | 7 | What opposites do, so they say |
| 47% | HAL | 3 | Film computer who says, "I'm sorry, Dave, I'm afraid I can't do that" |
| 47% | HAL | 3 | Movie villain who says "I'm sorry, Dave. I'm afraid I can't do that" |
| 47% | HAL | 3 | Evil computer who says, "I'm sorry, Dave. I'm afraid I can't do that" |
| 46% | DONKEY | 6 | Shrek's best friend in "Shrek" who once said, "Because that's what friends do. They forgive each other" |
| 46% | EXERCISECAUTION | 15 | Do the opposite of what those who 17-, 28- or 35-/38-Across do |
| 44% | DARE | 4 | Say "You can't do that!" to, say |
| 44% | OLDDOG | 6 | One who can't learn new tricks, they say |
| 43% | JFK | 3 | Prez who said "Ask not what your country can do for you ..." |
| 43% | ETTA | 4 | James who said, “People that can’t stand to listen to the blues, they’ve got to be phonies” |
| 43% | FLY | 3 | What Superman can do that Batman can't |
| 43% | EVER | 4 | Word that can follow who, what, or when |
| 43% | LIECHEATSTEAL | 13 | What a cadet won't do (or tolerate those who do), per the West Point honor code |
| 43% | JFK | 3 | President who said "Ask not what your country can do for you ...": Abbr. |
| 42% | HYPOCRITES | 10 | They don't do what they say |
| 42% | MOVE | 4 | What someone who's immobile can't do |
| 41% | RUNDEEP | 7 | Still waters do it, so they say |
| 41% | ERASE | 5 | What many pencils can do that magic markers can't |
| 41% | ALLSORTS | 8 | What it takes, so they say |
| 41% | DEVIL | 5 | Who may care, so they say |
| 40% | THENERVE | 8 | "I can't believe they did that!" |
| 40% | BREAKFAST | 9 | Most important meal of the day, or so they say |
| 40% | HUMONTHERANGE | 13 | What cowboys do when they can't remember the lyrics? |
| 39% | ASK | 3 | What it doesn't hurt to do if you're confused, they say |
| 39% | LEOPARD | 7 | It can't change its spots, or so it's said |
| 39% | NINE | 4 | What a stitch in time saves, so they say |
| 39% | FLY | 3 | What Dumbo could do that other elephants couldn't |