Just a quick note to mention that I've seen this floating around various facebook pages (usually in the comments sections of profile pages):

I should stress, there's no indication of this being posted as a result of an infection or anything like that, but it does seem curious that people would start randomly posting the above on their friends pages, even if doing such a thing was funny, oh, about five years ago.

For those who don't know what pressing ALT + F4 does, here you go.