CAMBRIDGE, Mass. (AP) — It is one of the highlights of the Massachusetts Institute of Technology that only lasts a few seconds.

Residents of an MIT dorm dropped an upright piano from their roof Thursday to celebrate the last day students can drop classes without having them appear on their college transcript.

About 200 onlookers watched as the piano crashed into a second piano, a baby grand, positioned on the ground six stories below for a better smash. People scrambled for souvenir pieces — keys, hammers, strings and splinters.

The tradition began in 1972 at the Baker House dormitory and has been observed sporadically until 2006, when it became an annual event, said Michael Plasmeier, who heads the dorm's student government that organized the ritual.

"It was sort of not the official event. It was just some students who had a broken dorm piano that they threw off the roof," he said. "Today, it's much more formalized and announced and planned with everyone."

The piano drop tradition is so popular that astronaut Catherine Coleman, an MIT alumna, took a piano key from the event with her during a six-month stay at the International Space Station in a nod to the tradition, Baker House housemaster Jeffrey Hoffman, professor of aerospace engineering and a former astronaut, said.

The event "is always one of the highlights or maybe lowlights, as the case may be, and it's a lot of fun," Hoffman said. "The students basically run it, we're just here to see nobody gets hurt."

The upright piano was rolled from a makeshift ramp on the Baker House roof. No piano has ever fallen on anyone's head, organizers say.

"It's done very safely, and it's done with coordination with MIT security and emergency management office, and we set up a barrier well away from the piano, and then the people on the roof receive training from the security and management office," Plasmeier said.

The tradition is a simple affair.

"There is just a countdown and the piano falls off the roof," he said.

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MIT freshman Connor Humber and sophomore Tom Moriarty were keen to show off the piano top and assorted keys they managed to yank from the piano wrecks as people rushed in for souvenirs.

"It wasn't what I expected. I mean, I was expecting a grandeur of noise," Humber said.

"He was ready for that twang when they hit and everything goes" Moriarty said, mimicking the sound of crashing musical instruments. " ... It was fun to see a piano hit a piano, you don't usually see that. It's really cool."

Broken pianos are used in the drop, generally donated by people eager to get someone to pick up the unwanted instrument for free. Other items may be placed below, such as the second piano this year.

"We have a certain reputation for getting rid of pianos for people so the pianos find us — people emailing all the time and say 'I have extra pianos. Can you please take them,'" Plasmeier said. "This year, we had someone who has five pianos and wanted us to take them, so then we contracted with the piano movers to pick them up from the people at no cost to them."

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Rodrique Ngowi can be reached at www.twitter.com/ngowi