This should be a "no duh" thing for the rest of us, but for one pilot, apparently that thought escaped him. 

On Thursday, President Barack Obama was on board Marine One when a small plane entered restricted airspace. That prompted the Secret Service to call for not one, but two F-16 fighter jets to be scrambled to intercept the aircraft. Once the pilot realized what he had done, and probably peeing his pants a little, he complied with orders to land at a nearby airport.

The Secret Service questioned the pilot at Long Beach Airport and they determined that the pilot meant no harm to the President, but agents did search the craft and found he was carrying 22 pounds of marijuana. The pilot said that he was flying from central California to Long Beach when he strayed into the President's airspace.

It's unknown if the pilot was arrested.