Professor Takenozuka presents an unusual and challenging question during his June 25 (6/25) physics lecture in Persona 3 Reload. The question, oddly directed at Junpei, concerns terminology related to whirlpool bath effects, prompting Junpei to seek your assistance.
While the exact setup of Professor Takenozuka’s question remains unclear in my memory, despite searching online for clarification, I managed to select the right answer through educated guessing.
What’s the technical term for when whirlpool bath bubbles create bodily vibrations upon contact?
I should mention that I’ve never directly experienced this particular sensation. Though I’ve generated bubbles in regular baths numerous times, causing significant vibrations, those instances typically involved my movements affecting the water rather than the reverse effect.

Let’s examine the three answer choices provided:
- The anchor effect.
- The flutter effect.
- The bubble jet phenomenon.
Upon researching these options online, none appears to be commonly referenced in luxury bathroom equipment terminology. However, “flutter effect” frequently appears in discussions about electronic music and mechanical engineering, particularly in aviation contexts. Since it relates to vibrations caused by air currents, this seemed the most logical choice.
This reasoning proved correct. The flutter effect accurately describes the vibration sensation caused by whirlpool bath bubbles contacting your body, confirming “The flutter effect” as the right answer. The professor’s decision to illustrate this concept using whirlpool baths rather than standard mechanical examples remains puzzling. In my view, this unconventional choice aligns with Professor Takenozuka’s generally unsettling character, which fits the overall tone of Persona 3 Reload.
This reminds me of a similar instructor at my school; Mr. [redacted]. He taught [redacted] and routinely carried a large [redacted] while walking around.
On a practical note, neither whirlpool baths nor the flutter effect appear in the final examinations, so you can safely disregard this information after securing your Charm points. Additionally, you can thankfully forget about Mr. [redacted] – something I wish I could accomplish myself.