"Ow. I hope you don't plan to be a motivational speaker any time soon." Telling him he should accept this as an unsolvable conundrum is practically a slap in the face. It also tells him this is a Challenge that he must obviously ignore such hearsay and Overcome.

Donatello is definitely not looking towards her and studying the buttons even harder. What is your secret??? His fingers don't touch anything yet but he points at one then another as he tries to make some sense of the configuration.

"I mean, I suppose I could do that..." he murmurs in that tone that suggests it would be a last resort kind of thing.