Just inside the Foster Gallery exhibition Contemporary Outlook: Seeing Songs, a Herb Ritts photograph of Michael Jackson. At the top of the label next to it: "IN MEMORIAM." 'Cause his death, you know, hit the MFA right here.
(That was my favorite moment, as the Italians singing Madonna was my least. But the exhibit only made me wish I had seen Visual Music a few years back, and that the catalog for it was not out of print.)
UPDATE: Other museums looking to pay tribute, alert your acquisition committee now.