Well, I learnt two things there: the meaning of the word 'borborygmus', and, far more interestingly, there's a cultural stereotype of animosity between US doctors and lawyers.
I'm in the UK, and in neither profession, but this is the very first time I've encountered such an assumption, and I'm pretty sure it's not one that holds here - the joke would have to involve different categories of people to work (like, I don't know, maybe fans of long-time rival football teams or something). Is it really 'a truth universally acknowledged' in America? Is it a common trope in jokes? What is the real or supposed reason for the ill feeling?

Lawyers fly economy?

pk - you're right in labelling it a common trope. From my experience (very extensive), there's not much basis in reality.

Didn't this lawyer say he'd spent the day trying a malpractice case? I took that to be the reason for the doctors' dislike.

In BrE I think the only person trying the case is the judge. Do I understand from the joke that in the US any lawyer involved can be said to be trying the case? Or have I got the wrong end of the stick?

In the U.S. we usually say lawyers "take" cases.

I don't have access to the video at the moment and can't remember how the joke was worded. Perhaps I've inserted "trying" where the joke did not.

In my very American courtroom, attorneys try cases.

Traditionally in the U.S. the lawyer tries the case, and the judge may either try it or hear it; in the U.K., the lawyer pleads the case, the judge tries it. U.S. judges also hand down their judgments rather than (as in the U.K.) handing them out.

I first heard the word as 'borborygmi' on a George Carlin album*. The 'i' never looked right to me, even though it sounded right.

*For the younger crowd: Albums were thin disks of hard vinyl, usually but not always black, with music or other sounds encoded in an analog fashion on both sides of the disk through the use of a single spiral path known as a groove.

I have been a fan of boborygmi since my first introduction via Ogden Nash. Interesting to see that it exists in the singular as a word, since it seldom exists in the singular in actuality.