I say they should have an 'El Clasico' between FC Barcelona and Real Madrid....Barcelona wins, Catalonia gets their independence, Real Madrid wins, they stay with Spain.
It happened already, 3 days ago, Barcelona 4, Real 3. In the fall 0f 2013 it was Barca 1, Real 0. With the balance of Classicos between those two teams in recent years, Catalunia became independent long time ago....