This raises one of my pet peeves with the FAR/AIM. "Random" and "arbitrary" do not mean the same thing. But the FAA always says "random." I don't want to take a random route between two airports. I want to take a predictable route that I have planned for.
But an actual clearance to fly "via random routing" makes me imagine en-route controllers rolling dice to decide where to send the guy next.
N12345: Salt Lake Center, Bugsmasher 45, level 6,000.
ATC: Bugsmasher 45, cleared to Chicago O'Hare via (sound of dice rolling) Victor 372, expect further clearance at a random time.
...
45: Chicago Center, Bugsmasher 45, level 6,000.
ATC: Bugsmasher 45, proceed direct (dice rolling) Hobby Airport, then direct Chicago O'Hare.
...
ATC: Bugsmasher 45, reset transponder, roll two twenty-sided dice for code.