Like a pickle, you need to have them full!!!!
Or a chapatti, a burger, a grape, a many other things!!
On the other hand sandwich is mostly halved!
Like an orange can be more than halved.
So life can be halved and enjoyed - shared and enjoyed!!! Sharing parents, college, hostel, home, food, bed, and many other things!
But not love or marriage! It has to be full or nothing at all. Because some things just can't be halved!!