YSK: you can use a flashlight to direct cockroachs in the direction you want.

Why YSK: If you've ever had cockroaches in your home, you would be familiar with the feeling of unease that comes when they escape your clutches while roaming freely within the crevices of your home and soiling your belongings along the way. Before that happens, you can use a flashlight to direct them to your 'striking zone.' I'm not sure of the specifics, but cockroaches are nocturnal, and when they see light, they interpret it as being exposed and vulnerable.

For example, if a roach is going left, shine the flashlight ahead of their path, and they'll go in the opposite direction. Afterward, use your weapon of choice to get rid of them.