Well, during an air show, an F18 was supposed to do a precision fly - by. But as it came in, a small bird flew right into the cockpit view. The pilot was so startled that he jerked the plane a bit. It didn't affect the safety, but it looked really funny from the ground as the plane made a little 'hiccup' in its smooth flight.
An F18 squadron was on a long - range mission. One of the pilots decided to play a prank on his fellow pilots. He pretended that there was a problem with his plane's navigation system. He started giving out really wacky coordinates over the radio. It took the others a while to figure out it was a joke, and when they did, they couldn't stop laughing, relieving some of the stress of the mission.
At an airbase, an F18 was being prepared for a flight. The ground crew painted a funny little face on the nose of the plane as a joke. When the pilot came to check his plane, he saw it and couldn't help but laugh. He flew the plane with that little face on it for the whole day, and every time he landed at another base, it made the other pilots and crews there chuckle too.