What color is a good book?
Read.
If you want a joke that can translate into other language here is one I like.
Three soldiers came to an enemy fort and needed to get past it. They decided it would take to long to go around so they decided they will climb over the roof.
The first ,an american(enter your race/nationality), goes first. BAM! BAM! BAM! The guards inside jump as they hear him on the roof. "Who goes there?" they cry. "Meow!" replies the american. The guards sit down.
The second, a chinese man, figures this can't be to hard. BAM! BAM! BAM! The guars jump up."Who goes there?" "Meow." The guards sit down. "Pesky cats" one mutters.
The third , a Polish man( use any nationality you want to make fun of, especially if everyone present is of one nation and one is the odd duck out), figures this should be easy. BAM! BAM! BAM! "Who goes there?" The polish man replies - "Just an itty bitty pussy cat!"