Do you remember what 2015's best social experiment videos were trying to tell us?

Unfortunately some of the clever and touching messages behind this years best social experiments have been forgotten

The human brain finds it difficult to focus on a tactile sense, like kissing, when also using the visual sense

2015 was the year of the social experiment. We saw it all, kids pretending to bully one another, people attaching fivers to signs, a semi-naked woman standing in Leicester Square, and slightly creepy men with a cute dog asking mothers to try and abduct their kids.

But as much as we enjoyed, shared, liked, imitated and talked about these social experiments that took place all over the world – we sometimes forgot what they were actually trying to tell us.

We’re still not actually really sure what the reason behind the infamous 'First Kiss" video was, but it certainly sparked a whole deluge of similar 'heart-warming' videos.

Below are some of our favourite social experiments from throughout the year, so take our quiz, and re-watach the videos to see if the often clever and touching messages behind these experiments actually stuck with you.

How did you do? Let us know in the comments.