LOL. He's not buying Coke. It was a joke he wrote on Twitter. He said, Maybe I'll buy Coca Cola and put the cocaine back in.
As for TWTR it is still trading below his offer price by over $4.00 so the market doesn't think it's a done deal. He just sold $8.4B worth of TSLA to do the TWTR deal but he still needs help in the financing.
And least you forget he has Asperger's syndrome which could explain his behavior. I really think he is over extending himself. But there is a fine line between genius and madness. We'll need more popcorn.