Hissing!

Here's a video of the sound of a hissing cockroach being annoyed by its owner.
I think that hissing or rattling of animals is a good affective way of warning off predators or rivals as its saying i wouldn't mess with me in not in the mood!

This hiss on the cockroach is a loud distinctive sound that they make when they don't want to be disturbed.
There are a few other animals and insects that hiss or rattle i like the sound of the rattle snake when its warning off the predators i find it fascinating that evolution has given them that to help them survive a bit longer as they can warn off other creatures.