There were three women who were best friends, took their breaks together, etc. And in the Christmas season they wore matching knit sweaters and would walk down the hall side by side so it would read "Ho! Ho! Ho!"
But one day when I was leaving the break room, they approached... and one was out sick. Before I could stop myself I asked "Where's the other Ho?"
Might've gotten a visit to HR from it if I hadn't looked so shocked at myself.