Explain SMBC — the wiki for Saturday Morning Breakfast Cereal

This single-panel comic shows a man in bed, covered in what appears to be blood or some kind of red substance, looking horrified. The walls and surroundings are also splattered. The caption reads, "It was the worst possible way to discover my wife's resonant frequency."

The joke is a physics reference. Every object has a resonant frequency -- a specific vibration frequency at which it oscillates with maximum amplitude. If you hit the right resonant frequency, the vibrations can build up catastrophically (the classic example being a singer shattering a wine glass with their voice, or the Tacoma Narrows Bridge collapse). The comic implies that the man somehow found his wife's resonant frequency, causing her to vibrate apart and essentially explode. The gruesome visual of the aftermath contrasts with the dry, clinical understatement of the caption, which treats this horrific scene as merely an inconvenient method of scientific discovery rather than a tragedy.