I'm rewatching the series for the first time in years, and I find myself asking the same question now that I did the first time around: How in the world can Sherlock forget things on demand? I know that it's a TV show, and that it's make-believe, but when he talks about "deleting" information on his "hard drive" (his brain), it's like... What? Are you telling me, Sherlock, that you could instantly forget your parents' names if you wanted to? Plus—and again I realize that this is a TV show, but I can't help but think these thoughts—the human brain is not at all analogous to a hard drive. When you learn a new skill, do you first forget an old one?

Am I the only one to have this reaction?