Rule reminder
Italian vision verbs differ in intentionality: 'vedere' = to see (passive/accidental), 'guardare' = to look at (deliberate), 'osservare' = to observe (careful/sustained attention), 'fissare' = to stare (intense, often rude), 'spiare' = to spy (secret, hidden observation).
Ho casualmente _____ un incidente mentre passavo per strada.