If two brown eyed parents both have a brown-blue chromosome set, they could both pass their blue part to their child thus creating a blue eyed child from brown eyed parents.
Eye color tends to be taught as an oversimplification. It is possible for blue eyed parents to have brown eyed children. There's something like 10 genes not 2 that create eye color creating more of a pool of genes to determine color rather than a rudimentary punnett square.
Well, for instance nobody knows after whom I got my lips. Everyone in the family has slim lips but mine are plump. The best guess we have is that I got them after my great-great-aunt or something like that. They also can't tell after whom I have my nose. Then, both my parents are brown-eyed, but my eyes are green/hazel/grey/they actually kinda change color depending on the weather (weird as hell). Also, I'm blood type O, which in itself isn't impossible, but since it's a recessive trait, it's not exactly common to get an O when mixing different blood types than two Os. But, then again, if one parent is an O, which in my case is my mother, this trait is not so rare.
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