Safety noise.

I heard this advert on the radio the other day. I'm quoting from memory so a word or two will be out of place, sure, but I swear this is accurate:

Nnnnnnnnmnnnnnnnnnnnnnnnnmnnnnmnnnnnnnnnnmnnnnnn...

This is the sound of a tattoo.

...nnnnnnnnmnnnnnnnnnnnnnmmnnnnnnnmnnmnnnnnnn.

[Silence]

This is the sound of another kind of skin art.

[Silence]

Skin cancer doesn't make a noise.

There was more, but I didn't hear it. Too busy shouting "What?"