Temporary files are, as the name may suggest, a bunch of files that will eventually be deleted one day. They are typically picked up while surfing the web, hitting up websites. While eventually, by design, temporary files are supposed to be temporary, they can build up. And, in rare cases, you may find temporary files using up a whole lot of space on your computer. Like the following:

I believe the most appropriate thing to say here is: that is a lot of porn, batman.

[via Reddit]