The scenario which would show an example of situational irony is 'Brutus says that he is about to do something that will make him well, but ends up killing himself.'
Explanation:
In literature, situational irony is a situation where something totally different happens or occurs than what was being expected. The outcome  contradicts to expectations. In the sentence, 'Brutus says that he is about to do something that will make him well, but ends up killing himself' we can see how the situational irony occurred. On one hand Brutus says that he is going to do something that will make him well, but on the other hand he takes up his own life which was totally unexpected for readers.
