Nothing because ghosts don't exist. Edit:Holy crap I just realized I didn't post this on /r/antijokes.
Just wait 5 minutes. They'll post about it.
Three. One to post it, the second to post a better punchline in the comments, and the third to complain that it's a repost.
Math problems actually exist
Like Crap or Feces (its the same) WHY Because its Ca=Ca (equal sign is a double bond)
One is white and scares young children and the other is a ghost.
Because they have Hollow-Weinies
I have left my Mark on Mars"
Holy crap.
If someone comments saying you posted an antijoke and that you should rather post your joke in /r/antijokes.