2nd funny problem ...
http://www.chess.com/tactics/server.html?id=27258
3rd funny problem ... these are close to the 2000 level btw
http://www.chess.com/tactics/server.html?id=36542
This one looks like something Rybka does when it knocks out all the material
http://www.chess.com/tactics/server.html?id=180492
This one isn't funny ...
http://www.chess.com/tactics/server.html?id=26269
I solved this in less that 20 seconds
http://www.chess.com/tactics/server.html?id=128231
I will post some more here later ... please try to solve the problem before reading the comments.