Bad things which are blue? 10 points best answer?

Cat with blue eyes.

Blue Bad

I feel only a dark blue has a not so good comparison.

It's often a colour associated with law and order.

Sharks and other creepy nasties from the deep ocean.

A blue ring octopus although it's tiny and looks pretty it's fatal.

Eyes can often look blue in blind or poor eyesight in many animals.

What about that Baby Blue Urban Tale to give kids nightmares.

Does Grandpa Smurf count?

The cold blue steel of a .45 in a junkie's hands.

As blue as the ice that sank the Titanic.

Bluer than the dead baby left on the church doorstep.

blue as a man choking on his own tongue.

Bluer than a tidal wave created by the god Neptune himself.

The blue ringed octopus in Australia,one bite & your dead!

flashing lights in your rearview mirror

blue balls!!!