Does anyone else get irrationally annoyed when some client's accounting dept comes back asking pointless changes to the invoices?

"Oh, you dated this September 25 but it should now be at least September 30, also there's a 2 cent difference on PO654687 and..."

Dude, my work ended at delivery, you're just standing in the way between me and my money. Just pay what I asked as soon as you physically can, it's not that complicated.