Are Waterbugs Drunks?

I was distraught to discover what appeared to be a giant roach (a “Waterbug”) climbing on my toothpaste in the medicine cabinet of my expensive new NYC apartment sublet.  Most New Yorkers I tell that to say, “Welcome to New York.”  This kind soul actually tried to assuage my fears, “A Waterbug is basically like a big dopey drunk trying to find his way home.  He just wants to get back to the sewer.  Don’t worry, he’ll be gone soon.”