1) It may cause a strike 2) Slider option 3) Ugly Betty episode 1) Unexpectedevent 
The curveball is a type of pitch in baseball thrown with a characteristic grip and hand movement that imparts forward spin to the ball causing it to dive in a downward path as it approaches the plate. Its close relatives are the slider and the slurve. The `curve` of the ball varies from pitcher to pitcher. Outside the context of baseball, varian.....[informant] Rafid Ahmed Alwan al-Janabi (رافد أحمد علوان, Rāfid Aḥmad Alwān; born 1968), known by the Defense Intelligence Agency cryptonym `Curveball`, is an Iraqi citizen who defected from Iraq in 1999, claiming that he had worked as a chemical engineer at a plant that manufactured mobile biological weapon laboratories as...
(from the article `baseball`) The fundamental, or regulation, curve is a swerving pitch that breaks away from the straight line, to the left (the catcher`s right) if thrown by a ...
A baseball pitch that is meant to break as it approaches the plate.
A pitch that curves or breaks from a straight or expected flight path toward home plate.