What was the most stupid financial mistake that you have ever made?

I had thousands in an investment fund and failed to remove it when they went into liquidation. Now I am not able to get my money back, but they send me a cheque for 5 cents every 3 months so that I can "recover" my money. I worked out that at this rate it will be about 25 thousand years before they pay me back all my money!!

Using my inheritance to pay off the cars and mortgage.

If I had held on to it, it would have been my money after the divorce and my ex would not have been able to make any claim to it.

She, on the other hand held on to hers, so I was out of luck.

Failing to balance my checkbook. My bank charged some maintenance fees that I forgot to add to my check register. My being forgetful resulted in several checks being bounced.

In short...trusting my ex. (He stole my identity and damaged my credit.)

NEVER MADE 1