When I first started at Google long ago, I came through an acquisition. As part of that we were all given a relocation package to move closer to the office if we needed to. When I was discussing the details with the HR/recruiter person on the phone I mentioned that I had been talking to my coworkers about the details and I had a logistical question that we couldn't figure out... and they stopped me dead in my tracks and told me point blank and very seriously: "you are not to compare or discuss any aspect of your offer with your coworkers", like I'd committed a cardinal sin. I was a bit shocked.

EDIT: FWIW the relocation package terms were all the same between everyone, so it was a bit ridiculous.