I popped a coolant hose 30 miles from home. Drove 10 miles before I realized what happened. Drove the remainder at full speed just to see what would happen while keeping an eye on the temp gauge (which was still responding to throttle).
Nothing happened. No coolant in the head but plenty in the block (which is why the temp sensor was working). It was winter and I was driving a turbo-diesel. I did sell a year later.
*
Probably the dumbest thing I've done over the years was buying all the cars I have, new. I can forgive the first one, can't rent an apartment while driving a beater. But the rest? That and buying a starter home, should have stretched myself a bit more. And should have put more into my 401k, and probably a bunch of other financial stuff.