Not everything that you believe is true. You'll be surprised about the things that you think you know and that you think are true but are, in fact...false.
1: Tins of baked beans
I bet you think that tins of baked beans contain baked beans. To be honest, I wouldn't blame you if you did. I mean, it's there on the label. There are rules about what you can and can't put on the food labels. However, the truth is that tins of baked beans don't contain baked beans. The beans in cans of baked beans have been stewed, not baked. (Source.)