That Mitchell and Webb Look/Tear Jerker

"Dr. John Watson: "Well...well, Holmes, another successful case for me to write up. Isn't that right?" Sherlock Holmes: "...I know, John...I do know. I can't get the fog to clear...""
 * The final sketch of episode six of series four involves an elderly Sherlock Holmes who is suffering from dementia and Watson, loyal to the end, trying to pretend that nothing has changed. It's played for laughs... until the very end where Holmes has a brief lucid moment:


 * Even when it's played for uneasy laughs, it's still very sad. Just the mere sight of the brilliant Sherlock Holmes suffering from something so awful is heartwrenching.