actually i watched an SBS documentry on guys that were sexually "excited" by really really fat women. So they fed their wives like buckets of icecream untill they were like 200+kgs.
you may go with b&g for enrollment advice, but i'm unsure about going to b&g. Usually its held in Melville hall
http://campusmap.anu.edu.au/displaybldg.asp?no=12
unsure, you would have to take it up with that hall/college. You'll probably lose your deposit... (the idea being that the money is used to 'secure' your place :) )
EDIT - you've already signed the contract right? yeah you can leave the contract, but it'll cost you.
EDIT2 - accepting one offer...
They're subject to change, god i hope so.
If you're at a hall/college then you will sign up on those days. From memory the colleges take mon-tue. then wed, thur, fri = the rest in alphabetical groups.
You go down as a group, so you won't miss it :)