Lenin and children

Story to tell friends. They have friends - a married couple of famous mathematicians. It happened before perestroika, in Leningrad. While these mathematicians son was seven years old, the child was intelligent and, as will be seen from the history, inherited the logical abilities of parents. He went to the first class.
In the native language lesson the teacher read the class a story Zoshchenko "Lenin and children". If anyone remembers, is the story about how Lenin suddenly appeared on the Christmas tree for the children and it seems that it is lit with colored lights. In general, the teacher read a touching story and began to ask the class questions on the text.

 - The story line has about the fact that when Lenin suddenly appeared among the children at the party, then "all the children were very surprised, some even scared." Why?

All are silent. The teacher repeats.

 - Why, when Lenin appeared on the New Year holidays, all the kids were surprised, and some are even afraid? Can anybody say?

All are silent. After a while, one child (a son of mathematicians) raises his hand.
The teacher happily:
 - Well, why not?
 - I think because Lenin had died long ago.
 What ... For this is perfectly reasonable, logical and plausible answer a child expelled from the lesson, the parents called the school and charged with the child in an attempt to undermine the foundations of socialist education by cynical mockery of the most sacred for the Soviet people ...

Sent Jerusalem artichoke