They teach some darn cheerful songs in Music class where I come from.
Immurement, by definition, is death by being walled in. It is known from many sources in many cultures all around the world. The example Hungarians are most familiar with, however, is our very own: The folk ballad titled "Kőmíves Kelemen" (Kelemen the Stonemason). You can listen to it sung here.
Castle of Deva: Twelve (in some versions thirteen) stonemasons are hired to build it, for a payment of half a bushel of silver and half a bushel of gold. But there is a problem: What they build till noon, collapses by the evening, and what they build till the evening, collapses by the morning, and they have to start all over again every day.
The building is not progressing, and they are running out of time. The masons make a pact: Whoever's wife shows up first on site to visit them will be killed, burned, and her ashes mixed into the mortar to make the castle walls hold.
(It is assumed that the whole thing refers to some pre-Christian building sacrifice practices)
Of course the first woman to come visit her husband is the wife of the masons' leader, Kőmíves Kelemen. He watches her carriage wind up the road to the mountain, and prays that she would turn back, or that the horses would drop dead. And yet, the lady makes it to the building site and greets her husband happily... only to find out the fate they planned for her. There is no going back from the pact. The masons kill her, burn her, mix her ashes in the mortar... and the walls don't fall down anymore.
You think this can't get any worse?
Kőmíves Kelemen has a little son. When he goes home in the evening, the boy starts asking for his mother. Kelemen keeps telling him she'll be home later... until finally he confesses that she is never coming home. The boy climbs the mountain to the castle and calls to his mother; the mother's voice answers from the wall, telling him she can't break free. The ground shakes, the earth opens, and the boy falls to his death.
Being a workaholic can really ruin your family.
(You wouldn't believe the amount of puns that exist based on this story...)