I work in an advertising agency, which essentially means that I can go drinking during the day and write it off as "research". A while ago we were pitching a critical campiagn to a BIG client, the biggest client this agency had. Most of our jobs depended upon keeping these guys happy.
So we were talking them through the boring direct mail part of the campaign when we came to the envelope colour. We had recommended orange... they decided that they liked green. We politely explained that the envelope was orange to ensure consistency with all the other elements of the campaign. They insisted that they wanted a green envelope.
Normally we'd stress why orange was important, but in the interests of keeping the client happy, we'd let them get their way. But something strange happened this time....this evolved from a simple debate to a fully fledged argument. Senior art directors presented their case, the creative director spent the next 48 hours in envelope meetings (at $300/hr!), the MD stepped in. All us lowly suits were made to work 20 hour days piecing together all the orange collateral we could collect from the past two years' worth of campaigns. Finally the agency paid for a shrink, who specialised in colour symbolism to present the case for The Orange Envelope.
Eventually we reached a compromise: green outside and orange inside. The client got what they wanted, and we charged them an extra $12,800 in head hours, so the whole thing was worth it.