[gmiller123456]

Funny, but obviously not real. If the guys were tired of "tired of walking over every time the bell rang", the number of defects detected wouldn't be 0.

[brokenmachine]

1.Bell is ringing too much and people are tired of walking over: defects > 0

2.Put fan there to blow empty boxes: now defects == 0

I don't see the problem.

[BioMeditate]

Yea you would put the fan before the check point so the line doesn't stop.