I got into considerable trouble once - not over slugs but snails... same thing with a roof.
As a student teacher my class-on-loan set up a habitat for snails. It sounded a safe idea at the time as the snails didn't bite, were unlikely to smell (too much) and could be gathered for free so "we" went ahead with the idea.
The children did some great work - research, writing, observation, art and science - maths too I suspect... (long time ago).
When I completed my time at the school the snails were returned to the wild and the library loan back to the college library.
Three weeks later - call from the irate librarian as one or more of the snails had eaten through chunks of some expensive reference books all about snails!! They appear to love paper! I was very nearly landed with a big bill..