What's your preference: A concussion or mono?

As an actor, which would you prefer to do take after take after take during filming?

- Allow someone to remove a pillow while your head is on it, sending your head slamming into a wall and risking brain damage.

- Allow someone to spit a pretzel into your hand, potentially passing along a communicable malady.

Need help deciding? Consider the following Continental Airlines ad:

I'd probably opt for the wet snack in my hand (at the 24-second mark), but I'd bring a vat of Purel with me to the set. The only problem with this decision: The guy whose head hits the wall (at the 17-second mark) gets a better angle on camera.