Why is Amitabh thanking Ranbir?

Wonder what this 'elixir' is..... Hmmmm....

Thanks to Ranbir Kapoor, Amitabh Bachchan is not only buzzing these days, but has also found the 'elixir of life'.

Yes, you heard that right!

Now we don't know what exactly that elixir is, but in his latest Instagram post, the Big B can't thank Ranbir enough for giving it to him.

Sharing an Instapic with RK, Big Boy Bachchan writes, 'Thank you Ranbir Kapoor for giving me the elixir of LIFE! Still buzzing Buddy...Ranbir Kapoor'.