the cat is probably having a stroke.

I'm sorry, where's the funny part?

#2 you mean normally they don't aim that well?

#15 you are right about the pan-slavic origin of "kurwa". This particular case however is in Polish. I've seen this clip earlier on a different site and it had a desription saying it's in Wroclaw, Poland.

Anyway, I wouldn't get any closer to that site with this demolition crew around.

#18 .. dude, what #10 meant is that Lithuanian is one of the Baltic languages (among the only two currently used languages of this subfamily - the other is Latvian), not Slavic.
Btw - Estonian belongs to the Finno-Ugric group.

As for the prank - #(removed comment) +1, damn this guy was dumb, not even checking the depth. But still, the people who made him do that are apparently way dumber than that and if I were him, I'd get medieval on someones ass.