No joke:

Officials say at least 10 killed after shooting during ‘Dark Knight’ screening in Colorado

Reports are confused, but it looks like someone wearing a gas mask went bugnuts in a theater in Aurora, Colorado, a few minutes into the new Batman movie, opening fire on the crowd with either an “assault rifle” (which, let’s face it, could mean anything) or a shotgun, and set off at least one explosive device. The shooter has apparently been caught, and rumors are he looks like an “Indian” (which *kind* of Indian is unknown as yet).

For further speculation, I can’t do better than this commenter on  a the relevant Fark.com thread:

Dr. Mojo PhD
2012-07-20 05:01:29 AM

It’s either radical Muslims, radical anti-Muslims, extremist Christians, extremist Jews, militant atheists, white supremacists, black supremacists, gangs, militia members, right-wing extremists, left-wing extremists, a lone nut, or several lone nuts who decided not to be lonely any more.

There, all the bases are covered.

But if it’s radical centrists, boy will I have egg on my face.