You are provided with an "Event" and it's "Intent" related to PersonX. Determine the sentiment value of the given input as either "Positive", "Negative", and "Unknown". 

[EX Q]: Event:PersonX gives PersonY a stare. Intent: 1) to have fun
[EX A]: Negative

[EX Q]: Event:PersonX becomes worried. Intent: 1) use public transport
[EX A]: Unknown

[EX Q]: Event:PersonX hears a knock on PersonX's door. Intent: 1) someone else
[EX A]:
Unknown