My favorite is how NSA is funded by government debt, which is their way of printing money. This is also true for the FBI too with the scare against encryption. One of the reasons we got off the gold standard decades ago was military spending.
The point is that the debt can increase forever since we got off gold.
This isn’t necessarily hard or bad, though. If I take $100 and loan it to my neigbor, the debt appears from nowhere. Heck, theoretically, he could loan it right back under different terms and create more debt. Debt isn’t necessarily bad—the fear is you’re builidng on jenga blocks, not that some guy is going to show up with a wrench.
In this case we are talking about government debt though. Congress does have some control over it with "appropriations" I think.