Seeing Is Not Always Believing; We See Wrongly

I can't remember how many times I must have used, 'seeing is believing'. In fact, I hear or see this cliché in a conversation/text almost every week. Of course, seeing is believing. But, if we examine this phrase in relation with some real life circumstances, we would see that seeing is not always believing. Digressing, the previous sentence would further butress the law that,"nothing is 100% guaranteed". The human visual organ is so strong that it can affect other senses negatively. That is the visual organ is capable of over-clouding the judgement of other sense organs.

1). Some weeks ago in Ibadan, Nigeria, a particular fish-seller set off an alarm after unpacking the carton of frozen fishes she had brought home. After unpacking the carton she saw a strange creature among the fishes, which she labelled a mermaid. She rushed to call people who could help, and most of them confirmed that it was a mermaid. Everyone who believed had all sorts of theories regarding the creature, and at some point it was all over the place that the mermaid talked after being worked on by "Osun worshippers." However, at the end of it all what some people thought they saw was just a misconception because the supposed mermaid was actually an octopus.

2). Few months ago in Obafemi Awolowo University, Ile-Ife, Nigeria, a particular student gave birth in the Moremi hostel hall toilet and wanted to flush the baby down the drain. So, we heard at first, but when it all went down, it was gathered that few people that was part of the party that first saw(or heard) her, saw(or heard) a scene that seemed that way. Blood all over the toilet, a baby in the toilet, and a lady  by the toilet, what else did people that always see the negative side needed? 
However, later on we found out that she wasn't trying to kill the baby, it was the other way round. And the reason the baby was in the toilet was because she was defecating due to running stomach and was not expecting the baby at all. Now, I can't be too sure what really happened, but at least this clearly shows different people seeing different scenario to a situation.

-I would love to write back-up stories(funny and stern) about the above stories but I'm trying to be objective here.

Now, let's take a look at two illusions:

1). Below is a video of an illusion called the Mcgruck effect, showing how what we see can influence what we are actually hearing.

2). Below is an image which appears to be moving but in actual fact it is not. It is arranged in such away to appear like that.



The point is you can't always be too sure of what you see, because what you see might just be a creation of your mind(not exactly). And the same goes for hearing, because you heard something does not mean you heard right.