1. Refuses to clean up his cave
2. Ululates in shower
3. Science fair project involves plastique.
4. Spends all afternoon phoning in requests to Total Jihad Live on al-Jazeera
5. When you tell him to go fly a kite, he tells you its sinful
6. Insists on getting his allowance by way of hawala
7. ipod loaded with Cat Stevens songs
8. Refers to siblings as "those infidels"
9. Insists on sleeping in a new room every night
10. Is awfully fond of that ZZ Top look
11. Voted "Homecoming Mullah" of his senior class

LOL, very funny! I can't help thinking that some people may take offence, but those people should just take it the sprit its intended...as a joke for the slow people out there.
I've got more to add to the list:

12: He wares a towel on his head when his hair isn’t wet.
13: Your teenage child refuses to shave of his cheesy facial hair.
14: Your child runs around shouting “Jihad” at every opportunity.
15: Suddenly asking which way Mecca is.
16: And the most important one of all he/she proclaims Usama Bin Laden the messiah