One phrase only, but how to use it?

Ottojust couldn't wait to use the sentence that had come to him like a flash from a clear sky. The sentence had been in his mind as he woke up, like an instant message from a presidential campaign leader cheating in a debate. (That was Otto's insiduous association, not mine. )

Otto walked his way to the office, talking to acquaintancies and colleagues as he arrived, hoping that soon someone would say something that would seamlessly lead up to his new sentence.
But it was exasperatingly difficult.
All day passed. Otto's shiny new sentence started to show the first signs of rust around lunchtime. At three Otto became aware that the edges of his new sentence has started to get worn and frayed. At six, just before Otto left for the day, he realised that the former glory of the new sentence had all but vanished. And it had never been uttered, even once.

- Au revoir, Monsieur, said the security guard. Bonne soirée.
Buggers! This might be the last chance to use the new sentence before it was completely decomposed, and the man didn't even speak English. It couldn't be helped. Otto smiled the wry smile he had practised all day.
- I feel a strong urge to be defensive, but it's not entirely clear how you try to attack me.
Somehow, this sentence had sounded better in his head, he reflected.

The security guard smiled indulgently, this was not the first time he had met an Englishman trying to speak French with such a terrible accent that it might as well be another language.