Choo choo puns

In this 9th Cir. railway tax opinion, Judge VanDyke includes a variety of railroad puns ("tracking," "getting sidetracked," "blowing smoke," etc.), prompting Judge Chhabria to start his concurrence:

"I join the opinion in full—even the cringy railroad puns!" And he concludes his concurrence with: The "Department was thus destined to lose the case before the train ever . . . oh wait, I think Judge VanDyke used that one already."

And see this 9th Cir. opinion which starts off by quoting the University of Montana Fight song:

“And the squeal of the pig will float through the air; From the tummy of the grizzly bear.”