Watson: “Surely there is great danger?”

Holmes: “Yes, Watson. Madness and death.”

Watson: “Shall I light it?”

Holmes: (smiles) “I thought I knew my Watson.  Yes! Light it!”

Douglas Wilmer and Nigel Stock as Holmes and Watson in the BBC 1965 Sherlock Holmes episode “The Devil’s Foot”.

Holmes: “Watson, I owe you my thanks – and an apology…  It was an unjustifiable experiment, even for oneself.  Doubly so for a friend.  I really am very, very sorry.”

 Watson: “You know it is my greatest joy and privilege to help you.”