Must roll,another point of view

["gmtac" <gmtac@xxxxxx>]

Ok,let's say i dont want to roll my position on alluminium,bond,corn , is it
really possible to get up a morning and find out the door tons of
alluminium,bonds(!) and corn?
In real world you must have money to buy  goods .
Margin is not enougth.
In other word: if I do not want delivery something, what can do the market
to me?
How many of you have got delivered some financial or commodities because you
forgot to roll ?

Thanks all
Mario