Ivar celebrated his 5th birthday on an airplane from PDX to SDF. I told the flight attendant on the first flight that it was Ivar's birthday. While we were waiting to take off, he made an announcement over the loudspeaker that there was a birthday on board. Then he turned off the cabin lights and had everyone turn on their flight-attendant call buttons. Then everyone on the plane sang Happy Birthday and Ivar pretended to blow out the lights.