Sherlock drinks embalming fluid while discussing the game he and Professor James Moriarty are playing.
Holmes: It's a game dear man. We're playing cat and mouse, the professor and I. Cloak and dagger.
Watson: I thought it was spider and fly.
I'm not a fly. I'm a cat.
Not a mouse, but a dagger. You're drinking embalming fluid.
Yes. Care for a drop?
You do seem...
Excited?
Manic.
I am.
Verging on...
Ecstatic?
Psychotic.
I should've brought you a sedative.
Clip from Sherlock Holmes: A Game of Shadows, with Robert Downey Jr. and Jude Law.