There's a Chabad-Lubavitch custom of reciting a psalm of T'hilim corresponding to one's age. That is, for example, in one's fourteenth year of life (e.g. on his thirteenth birthday), he says the fourteenth psalm. (I'm not sure whether it's recited only on one's birthday or throughout the year. But that's immaterial for my purposes.)
The Luach Kolel Chabad says that this year (5775)'s eleventh of Nisan would have been the last Lubavitcher rebbe's 113th birthday, so everyone should say the 114th psalm on that day.
T'hilim has 150 psalms. What will Lubavitchers do in the year 5812, on the rebbe's 150th birthday?