An Italian astronaut. 
Think about it; it may help to say it out loud. 
BTW, an Italian guy (my physiology prof) told me this joke.
Ohhh…I get it! It took me ten seconds. 
Okay,
I guess I’m stupid. I said it outloud and still didn’t get it. Am I stupid or what?
Kathy
Space man.
Specimen.
You not only have to say it aloud, you have to say it like Senor Wences.