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A cautionary sign inside the flame bucket.

Rather than warn of the dangers of a simulated rocket blast as one might expect, this sign actually warns about the possible effects of the vibrations of the platform on which the visitors stand during the engine test:

Caution

The Force contains extremely loud noise and heavy vibrations. This exhibit is not recommended for guests with any heart condition or heart devices. Due to the intensity of the sound, it is also not recommended for small children who might be alarmed by sudden loud noises.

When we visited while the exhibit was being installed and listened to someone explain what the final experience would be like, my wife became slightly concerned: She has relatives who have ICDs and pacemakers, and was aware that certain frequencies of vibrations could cause an ICD to erroneously believe that the patient is experiencing a cardiac event and could shock the patient's heart.

She spoke with a supervisor-looking woman carrying a clipboard about her concerns, and when we visited eight days later, this warning sign was posted.