Indeed. I suggest applying the logic below:
1. If you do not see one of the many English or AU flags next the the poster, exit this test. If you see a US flag, proceed with caution.
2. If the post is defamatory or incites violence in any way, it's probably a joke.
3. If the person posts the same comment several times or writes page long rants on it in unrelated threads, they're a nut job and you should probably actually be shot.
Note: 3 is not a joke.