"Tissue samples aren't likely to break anything," Sherlock says pointedly. He's been known to, when in a mood. Of course, he's been known to in the process of experimenting, as well, but at least that isn't malicious.

"Or hurt anybody," he adds, on that note. "Myself included."

That he's certainly been known to do. Their first experiment together was certainly indicative of that fact, what with all the blood, but he wasn't bored then. Bored is worse. Bored is when he's got to test the boundaries of things, risk ruining everything just so he can be clever enough and focus enough to fix it again.