I have been to Coimbatore a LOOONG TIME back - but remember that there was a place where they had a 6 foot Dosa (South Indian Dish). While it would not be edible by one person - it might be worth a visit to that restaurant just to see this.
I guess it may not even exist anymore - and also I know for certain that there are other places that now have broken that record over and over - but at that time (circa 1990 or so) this was quite a big thing.
But this thread just made me remember that.