The story is told in Benghazi of a Libyan who was new to the United States and was taken to a New York comedy club shortly after he arrived in America: The sound of boisterous laughter nearly gave him a heart attack. The sound was utterly foreign to him. I could go on....
I don't know about Arabs but Iranians definitely have a sense of humor. I once knew an Iranian named Hassan and at first he didn't seem to have much of a sense of humor. Anyway, I sometimes would leave long messages in an Iranian accent on his answering machine as if I were Ayatollah Khomeini speaking to him from the dead and giving him strict instructions on how to avoid the temptations of American culture. That really cracked him up. So much so that when I quit leaving those impressions on his answering machine, he begged me to do it again so he would have some laughs when he got home.