Biggest mistake made on the job?

[MareImbrium]

I recently made a slight error on the payroll last week. I forgot to go back to the preference settings to check "print pay period in memo." There were 22 checks that were printed so it was useless to void them all. And then I forgot to go into the liability preference to change the new 2004 UI rate. I had to input everyone's hours all over again.