A mechanical, electrical and civil engineer are discussing what sort of engineer God must be.

The mechanical engineer says, God surely must be a mechanical engineer because look at how the muscles and bones work together perfectly.

The electrical engineer says, God surely must be a electrical engineer because look at how the brain uses electrical impulses to stimulate muscles and to taste and make the senses work.

The civil engineer says, God surely must be a civil engineer because who else would put a fun park between two waste disposal units.