Can we talk about what happens when there is a collision? I like to envision dividing by zero, a star dying, Roger Ver ascending to heaven, and your computer literally exploding with bitcoins shooting out of it.
Two people have access to the same empty account and neither knows it. Hardly spectacular.
someone generates a new address and then finds there is a large balance in it == Someone else awakes in the morning and finds the large balance in his address was transferred to another random address.