VLC player comes with a bunch of cool effects that can be added to a video playback.
Here is how to enable them :
From the main interface, go to Tools > Effects and Filters.
Then, under the Video Effects tab, scroll right to the Advanced tab. Here, there will be various effects that can be added to a video like Motion detect, Water effect, Psychedelic and so on.
The video with Psychedelic and Water effect will look something like this :
When the Mirror effect is enabled :
The original video now will have a mirror reflection.
Other cool effects like Spatial blur will smoothen the video playback :
Try out all these effects, they can be useful and  fun too.