When a software tester comes up to your desk and complains about a bug, and you have no idea what to tell him, just use the following list and pick a number:
- This has always worked fine…
- I didn’t change anything…
- It works here!
- Weird, I tested this!
- My unit tests were all green!
- Are you using the latest build?
- … probably changed the code.
- I’ve never seen this error before…
- That’s not my code!
- I think this has never worked before…
- The database changes probably haven’t been done yet.
- Was that included in the functional design?
As Dave Barry would say: I swear I’m not making this up! The “excuses” in this list are taken from what I hear every day. Sometimes they even make sense 
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