I woke up at 0330 worried about my taxes, so I got coffee and started plowing away. And I discovered after filing I had mistyped my SS number by one digit, so return was rejected. Easy fix fortunately.
I feared I'd get charged twice to file, which gets expensive as I file in two states now (last year for that). Fortunately, I get a bit back (that was already withheld, so no boggee).