and I have the following to prove it! 
It is said that when you tell an Englishman a joke, he will
laugh three times. First - when you tell it, to be polite.
Second - when you explain it, to be polite. And third - in
the middle of the night when he wakes up and finally gets it.
When you tell a German the same joke, he will laugh twice.
First - when you tell it, to be polite. And second - when
you explain it, to be polite. He won’t laugh a third time
because he will never get it.
When you tell an American the same joke he won’t laugh at
all. Instead he will say, “It’s an old joke and besides,
you tell it all wrong!”