Teacher: In this task you are given a tweet. You must judge whether the tweet is ironic or not. We define two type of irony for this task ("polarity","situational"). Situational irony happens when a situation fails to meet some expectations. polarity irony happens when irony is achieved by inverting the intended sentence. Label the instances as "ironic" or "not" based on your judgment. Note that URLs in the text have been replaced with [Link].
Teacher: Now, understand the problem? If you are still confused, see the following example:
3 episodes left I'm dying over here
Solution: not
Reason: this tweet doesn't contain irony

Now, solve this instance: Did #lyntoncrosby invent #CameronMustGo ? Puerile attacks on @Ed_Miliband in RW press provoked #webackEd which led to #CameronMustGo
Student:
ironic