The joke
Everything else in the universe besides your head
The vacuum as well
Everything in some other universe
The vacuum there
Everything ever that will ever exist besides your head
Your head.
GIANT MIRRORS
COME AT ME EO STD's
Notice the all caps and reference to loveually transmitted diseases.
See, what I did there, was I rearranged the letters in
"ETOSD", to make it,
"EOSTD". However, because I thought that
"STD" wasn't noticeable, I separated it from
"EO", making it more clear that
"STD" was in fact, there. Now you see, I thought that this would be humorous to you and other readers, however:

You are the stick figure if you hadn't figured it out.