Dear [Totally witty office nickname like, "Chief" or "Lady D" or "Big T"]:
Remember when [inside department joke referencing Dilbert-like antics, ie: the time you brewed regular coffee in the orange decaf carafe in the office kitchen]? Wow, that was fun!!
Or how about [vaguely sexual inside joke]. I can't believe nobody saw that coming!!
Well, you know what they say: [mandatory over the hill joke]!!
With Some Sort of Ambiguously Offensive but HR-Appropriate Term of Endearment,
Your Totally Witty Office Nickname Here
