How to earn grapes?

I am looking to earn grapes to unlock dm, not because I want to use it really, but looks good to have a privilege of using dm, just like the pi**ted movie cds we used to collect but never really watch that much. So, wanted to know the process of getting the grapes 🍇. Well, should this message start a controversy as I intend (read pun intended), I would be getting it finally.