"An Engineer and the Guillotine" joke

They were leading a priest, a drunkard and an engineer to the guillotine. They
asked the priest if he wanted to face up or down when he met his fate. The
priest said that he would like to face up so he would be looking towards heaven
when he died. They raised the blade of the guillotine, released it, it came
speeding down and suddenly stopped just inches from his neck. The authorities
took this as divine intervention and released the priest.
Next the drunkard came to the guillotine. He also decided to die face up hoping
that he would be as fortunate as the priest. They raised the blade of the
guillotine, released it, it came speeding down and suddenly stopped just inches
from his neck. So they released the drunkard as well.
The engineer was next. He too decided to die facing up. They slowly raised the
blade of the guillotine, when suddenly the engineer said, "Hey, I see what your
problem is."