According to this research, ads in video games are more memorable when the game includes a violent component. This makes evolutionary sense, there are good reasons to pay attention during violent incidents. If you survive violence, you should remember what happened so you'll be able to survive next time.
This ability to learn quickly in relationship with violence might be useful in Instructional Design, especially when teaching facts that are inherently boring. For example, imagine a version of Quake which requires you to shoot one specific molecule type while avoiding shooting any of the others to teach organic chemistry. While you're looking for that one molecule type, you have billboards in the game world that teach you the others, which you'll need at higher levels.