It's usually Greg, but as he can't make fun of himself, someone has to do it.

"I'm pretty sure his alibi checked too. Everyone loved this woman." He stops to think, and suggests, seemingly at random, "Maybe she wasn't murdered? All the blood could be from a ... an embolus in her stomach, and she could've been bulimic and purged herself to death. Robbins said the stab wound wasn't what caused the exsanguination, after all --"