Quick Tutorial: How to find a missing bug.

0) Wake up & have breakfast
1) Goto work
2) Do your job until the end of the working day
3) Make a backup
4) Shutdown your PC
5) Stand up
6) Go to the office door
7) Grab the door
8) Now the phone rings
9) Turn and go back
10) Take the phone
11) Now you get the bug report

This is a well approved method.
It always works!