I recently received back a piece of documentation for a precision tool I use at work and discovered that there was a problem with the serial numbers.  Normally, these things are tough to fuck up but the person at the other end must have been particularly talented.  On the calibration certificate, the person had manually struck through with a pencil the serial number and just written the correct serial number under it.  That would stand up to about as much FDA scrutiny as someone who’s trying to get into a bar with a license where the age line had been struck through and fixed with a Sharpie and the words “OK” written on top of the line.  I call the person in question and she faxes a “corrected” version to me, which still has the error but it’s signed!   Forehead slap.