User blog comment:IndigoOnIceCream/What Would They Think/@comment-8815453-20120331231837

Let me see...

Telling mediaeval Europe Leaders about the 1886 Mercedes-Benz and other cars in Europe from then on would probably interest them or scare them.

Telling the Russian Tsars in the past about their nation falling and soon being equipped with nukes would scare them.

Telling the old Joseon Dynasty about a divided Korea would anger them.

Also, by taking a look at the subcultures, entertainment, and modern media (especially tv, games, internet) as well (mainly the pre-modern leaders before the industrial revolution), the older leaders would probably be horrified, angry, happy etc by the citizens of their future generations as well. Examples:

Showing the old Japanese samurai Shoguns in the 1500s about the (Or more specifically Youmu Konpaku and Watatsuki no Yorihime), they would probably be: either displeased, liked it, or wondering why their future generations would create something like this or something else.

Showing Stalin the Tetris game, he would probably be either angered or would be proud that the game could have spread their influence (how would that work out?)