I'm so glad we don't have those. I saw them in a museum - something called a viviarian where the cockroaches live and people can see them. That was enough.
Once we had such heavy rain that the basement was knee height in dirty water. My housemate said he woke up and his flip flop was floating next to his bed. We had to put on wellies and put all the electric stuff like the fridge on bricks.
So, anyway, in three days the water cleared. What we didn't know was that the extra moisture and dirt had made the perfect climate for slugs to lay their eggs in. (We did, I must add, clean the kitchen because we're not disgusting but couldn't get everywhere quickly enough.)
I came back late from a shift and went to the kitchen. As I was coming down the stairs, I could see that there was a strange swirly pattern on the kitchen floor.
That's weird, my tired brain thought.
So I turned on the light and oh yes, it was well over a hundred baby slugs crawling all over the kitchen.
I did the grown up thing - I screamed, ran to my room, retched into my pillow and texted my housemate. At least I didn't need to worry about filling my belly. I wasn't hungry after that sight.
Sometimes I still see them in my dreams.