I once watched on a late Monday morning as two airshow F-15s taxied with their canopies raised down to the end of runway 4 by the Engineering parking lot. Most of Engineering was out there pressing our noses against the fence as we had friends in the tower who had given us the heads up. They made the turn to face NW, lowered their canopies, snapped off simultaneous salutes to the Engineering crowd, went to full AB on -100 engines, let the brakes off and took off simultaneously. It was EXTREMELY loud. They climbed to a couple hundred feet only, made a U-turn and came back down the runway at about 50 ft. When they got almost to us, they snapped the stick back and climbed vertically under full AB to about 10,000 feet. That is how they left. What a show!!!