I think this had been posted before but that probably was a low-res version.
The terrible sound you never want to hear while working on a turbine engine because hearing that means that the engineer must go through an elaborate process to find and remove the dropped part, including possibly removing whole sections. If not done, when the engine is next used it may tear itself apart as that loose part is run through the turbine.
Some have criticized the commercial because the husband is giving his already rail-thin wife an exercise machine. Of course, there are OTHER possible more acceptable explanations such as they are both exercise nuts but she had complained that she wasn't able to get out as frequently as she preferred because of various reasons.