The little slugs in my garden go pretty fast - I reckon you could use them as racing slugs.
And the big ones are veritable houdinis. I collected some up and put them in a bucket, thinking I would take them and release them somewhere a long way from my beans and potatoes. I put a sieve over the top to (as I thought) keep them in. When I came back one was half way through one of the sieve holes - big fat slug fore and aft, and a very thin, moving, waist.