It annoys Sherlock to no end that the only mysteries he can not deduce the answers to are the Scooby doo mysteries.
Sherlock Headcannons
By Helsing_Wick
All credit belongs Sir Arthur Conan Doyle and Moftiss More
It annoys Sherlock to no end that the only mysteries he can not deduce the answers to are the Scooby doo mysteries.