The capital, infrastructural and natural, and the factors of products MINUS financial capital and the workers. Simply put, the financial capital is NOT a mean of production because no matter how much money someone has, only he who owns a factory can process natural goods and make e.g. food to eat and survive.
You: After college, I can't wait found my company that's inspired Microsoft, named Megahard.
Best friend: Aww man that's a great idea! Seize the means of production my man!