Thing that should so totally happen:

Sherlock Holmes time loop. Seriously. homg it would be so cool. I'm not sure if it would be more fun with Holmes looping - because you know he could really figure out how to put the no-consequences thing to best use - or Watson looping and Holmes still managing to keep one step ahead of him, most of the time. With eventual temper tantrums and breakdown sequences and love confessions and then the loop breaks and they have to figure out how to be normal again and seriously, why is this not the sort of canon that utilizes genre crack premises?!