Insect that you fear seeing the most at home

Saw a praying mantis on my ceiling yesterday and it was the first time I've seen this creature. I tried to get it out the window but it clung on and I ended up killing it with insecticide (sorry insect lovers).

What are the insects that you fear to see the most in your house?

Personally for me, it'd be flying cockroaches or grasshopper. For some reason, grasshoppers and waterbugs are the insects that I'm scared of the most.

I've encountered earthworms, centipedes, dragonflies, crickets, cockroaches and beetles at different places I've stayed in before. Centipedes were kinda scary when they're long and also move at surprisingly fast speeds, but at least they don't fly.