I once had a House Snail!
Goodness know how it had got in but the nibbled paper on the door-mat gave a new meaning to "snail mail". I don't think I ever found it, despite trying to trace the mucous trails.
Around the same time my girlfriend's cat was most put out to find slugs coming into the kitchen through whatever secret tunnel they had, and eating her (the cat's, not GF's!) food. I thought slugs were vegan but these obviously liked meat-based pet-food.
Great big toffee-brown things they were, with little tiny white mites ambling about on them, which didn't seem to worry the slugs, but the gastropods generally tend to be rather inscrutable animals. I evicted them though the cat-flap, then spend some time and effort cleaning the goo off my fingers. It seems quite water-proof, must be some use for it in engineering!
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Nick – I can understand your frustration at being so patronised by the school's "Safety" botherers, but could you not use gas firing?