Clowns
Most likely, the hissing repels predators long enough for the hissing cockroach to escape and breed, thus passing the genes that contribute to hissing biology on to another generation.
Madagascan hissing cockroaches make a noise by forcing air out of a special hole.
They hiss to scare off predators and males hiss at other males when they fight over a female.
the males have the bigger bumps to fight with for the females
I doubt they would be if they had the ability to see the colour yellow.