Least favorite is martial law because I doubt I'd live to see the people uprise. Or I'd be too old to join in. We're such a soft nation now, it'd take a long long time before We The People could get anything done. Also, white folks.
Anyway, I'm also not here for aliens. I just don't fool with alien abduction/invasion stuff. I'd go crazy like dude on War Of The Worlds and be ready to shoot any and every thing that moved.