Couldn't you have got a nice furry office-sized creature (hamster, gerbil?)? Those giant snails are scary - what if it escaped? Think of the mess it would make, eugghhhhh!!!
P.S. Whatever you do, don't be tempted to eat it in the case of a sausage sandwich famine, they can apparently carry a parasite which causes meningitis
http://exoticpets.about.com/cs/rarespecies/a/pestsGALs.htm