Today's insanity:
Another team: we're getting poor performance to your systems, how long will the outage will be to cluster X.
Us: We retired that cluster three months ago.
Them: Oh yeah, that's how long this has been going on. Why didn't you warn us?
Us: First, we shut the cluster down three months before actually retiring it, so anyone who had a problem would notice, and could tell us about it. Second, we sent out a company-wide email telling everyone we were doing it.

Gaaaaahhhhh!