I work on people's computers as a side job. Well, one customer brought in her computer and I set it on my workbench. After she left, I was walking toward my workbench and I see 2 or 3 baby cockroaches running around. WHAT!?! LOL I started looking for them and could not find them. Weird! So I sit down on the desk next to the workbench to start documenting the customer's computer and looked over and there they were again. I jumped out of my chair fast, determined to find out where they're hiding. Sure enough, they were nesting inside my customer's computer.
We've never ever had cockroach problems, so after the customer picked up her computer, my wife and I turned our garage upside down to make sure they didn't leave any "gifts" behind.