I specified a requirement where certain bits in a certain message shall be evaluated for certain items. The tester came up to me and talked some BS about how to guesstimate these bits by totally different bits. I said, look up the interface definition, the bits are there. Got an email, same BS. Tester was just too lazy to look it up. So I answered that message ID X has bits 60-63 for the four relevant items.
However, I carefully avoided telling him which bit was for which item so that he knew what it was, but I still forced him to look up the inter fucking face definition.