I had some pretty big "What ifs" happen to me.
Back in 2001 we bought a run down wash and did an extensive rehab. Of course we borrowed a huge sum of money which we knew would be adequate. Just as everyone we went over, and by about 50K. We knew that we could borrow more, but felt we could squeak by without doing so. We got the place all done at the end of August and were prepared for the money to start rolling in. Well, we all know what happened on 9-11-01. The business at all of the washes tanked. It was a looonnnggg lean fall and winter. I went without pay for a few months (I don't have another job), but made it through with everyone else none the wiser.
Fast forward to spring 2005. We did a large expansion at another wash and spent nearly all of our cash on hand in addition to what was borrowed. August 2005 was when hurricane Katrina hit and sent the country into another tizzy. That and bad weather sent the business into the tank again. Once again I did a repeat of the fall of 2001. Once again though, I didn't have to go hang my long face in the window at the bank.
Just be aware, $h!+ happens!