In article , NONONOmisc07
@bigfoot.com says...

What is the undercarriage?

I believe that's what the English refer to as "twig and berries".

What sort of damage can one do to the undercarriage? Other than
busting a ball joint, they seem pretty reliable.

You don't want to know. Trust me on this.

What does one have to do to do that damage to the undercarriage?

Be on the receiving end of a well-placed kick, lose one's footing at an
inopportune moment when climbing over a fence, suffer a bicycle-riding
mishap, **** off a spouse who's fond of knives...

--
Dave