A Tortoise joke

I mentioned to Bob, a guy I work with that we had a couple of Tortoises and he told me this Tortoise joke that has had me chuckling for days!

A Tortoise gets attacked and beaten up by a gang of Snails.
Next day whilst receiving treatment at the vets for his injuries he is visited by a police officer.
Police Officer: "so can you tell me what happenned then?"
Tortoise:"Don't know - it all happenned so quickly!"