As a kid I watched some movie where cockroaches were coming out of lava filled cracks in the earth as if from hell. The cockroaches were somehow intelligent and teamed up to kill people. I don't remember the movie name but I can't get that shirt out of my head and is the cause of my deathly fear of cockroaches.
Watched a bunch of movies as a kid where various animals were portrayed as evil killers but none of them caused the same lasting fear.