If it's something like an IKEA sofa, i think you could slowly start breaking it down into pieces, grinding into sawdust and shredded fiber and

A) throw it out handful by handful with the rest of the garbage
B) cut a hole in your pocket and dispose of your now granular sofa 'a la Shawshank Redemption' (fill your pockets with sofa, go for a walk and let the pieces of sofa fall through the holes in your pockets)
C) Post pieces of sofa to any freepost spam you get in your postbox
D) Use it as kindling while it's still chilly, you will need a fireplace for this (The alternative to this is to have regular BBQs and add sofa as fuel.)
E) I hear sofa soup tastes pretty good.

Good luck!