Simple:
* Do you disagree with me?
* The doctor disagreed with the diagnosis.
* We disagree on the details, but agree on the goal.
More challenging:
* Did you see Dee Dee disagree with the decision?
* The three thistles that the three thieves stole, the thieves disagreed about.
* The disagreeing donkeys, Dan and Dave, did a dreadful dance.
Humorous:
* My dentist disagrees with my sweet tooth, but my taste buds disagree with him.
* The grumpy gnome groaned, "I disagree, I disagree!" But nobody listened.
You can create your own by playing with the sound of "disagree" and adding alliteration or rhyme!