Aspergers ranges from severe to mild to "aspy-ish". I find that lots of kids I see in my practice with ASD have very wicked and dry senses of humor. They also tend to be the least impaired. Again with the imaginary play...see it a lot - often in their field of expertise. They have a much harder time engaging in another's imaginary play where they have no input or control.

You ds' sense of humor is an asset he can use to connect with others.