To go spare means to become very angry or irritated, so Uncle Sven would be very angry if he found out about the situation.
Context: Uncle Sven would become extremely angry if he found out I spend my evenings drinking with negroes, but quite frankly I don't care.
Hypothesis: Uncle sven would go spare if he found out I spend my evenings drinking with negroes, but quite frankly I don't care.

Given this context, is the hypothesis true (Yes/No/I don't know)?