low commotion

A "hushed hullabaloo" response from a crowd of amazed onlookers when witnessing da movement of a creature or machine from one locale to another.

Maybe a group of observers watching a newly-unveiled conveyance-contraption proceeding forwards and/or backwards would indeed start out responding with merely a "low commotion", but soon they would likely give a rousing cheer and really start noisily jumping up and down in gleeful excitement.