system
A chat on subreddit /r/NoStupidQuestions
human
Go electrical over plumbing.  It's easier on your body, smells better, pays about the same.  Also, join a damn union.  The pension and health insurance are half the point.

Source: electrician.
gpt
Yeah y’all got a sweet gig, you guys don’t even have to drill any of your own holes because you just use everyone else’s. 

Source: plumber.