Sometimes engineers really are quite marvelous.
They think of things that no one else will think of, and those things turn out to actually be useful. Or, in very rare cases, amusing too.
Here is something that is both immensely utilitarian and entirely engaging.
NASA engineer Mark Rober used some red sauce and two iPad 2s in order to pretend, at whatever Halloween convention he might be attending, that he has a vast, open, and bloody wound through the core of his torso. You can read more about it here.