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Crapshoot
Unpredictability Emphasis
Use 'crapshoot' to stress the lack of control over an outcome, highlighting unpredictability. 
Casual Tone
'Crapshoot' is informal and best suited for casual conversations, not formal situations. 
Positive or Negative
The outcome of a 'crapshoot' can be unexpectedly good or bad, so it's neutral on its own. 