Do you remember Darth Vader's famous Star Wars quote as, “Luke, I am your father”? Or perhaps you recall The Berenstein Bears books from your childhood? If either rings true, then you’re experiencing ...

Add Yahoo as a preferred source to see more of our stories on Google. Test how well you remember the past. Is it the Berenstein Bears or the Berenstain Bears? Does Curious George have a tail or not?

Experts don't know exactly what causes the Mandela effect, or false memories shared by a group. It may happen when your mind blends events and images or tries to fill in gaps with prior knowledge.