> I "invited" the LAPD Bomb Squad to my High School Graduation when some punk kid crawling on a roof he was not authorized to be on found a little science demonstration a friend and I had set up for the time of graduation and told a gym teacher who took the science demonstration from where it had been safely installed and placed it in his enclosed office and called the LAPD Bomb Squad (on my behalf.)

"Punk kid" was crawling on a roof. He was not authorized to be on said roof. He found the OP's science demonstration that he set up on the roof to go off during graduation. The "punk kid" told a gym teacher, who contained the experiment to his office and called the LAPD. The bomb squad arrived to investigate.

(Where science demonstration is probably something like fireworks, skyrockets, roman candles, m-80s, but OP is being vague, so we can't be sure.)

He'd setup some blow-up stuff (likely fireworks/rockets of some sort) with a friend on high-school roof in preparation of graduation, an other student crawled on the roof, found it, snitched to the principal who called LAPD Bomb Squad and moved said stuff from the roof to his office.

He worded it as if his "experiment" had been an invitation to the LAPD.

The author of the parent comment set up his own 'experiment' on the roof of the school that was planned to go off at graduation. I am assuming it was nothing malicious but something 'fun' like fireworks.

Unfortunately for the author, another student climbed the roof and discovered the 'experiment'. He reported it to a gym teacher, who was suspicious of what is was and subsequently called the Bomb Squad, therefore spoiling the graduation 'surprise'.

He put some sort of device that would make a loud boom up on a roof, intended to coincide with his graduation ceremony.

Another kid found it and reported it to an authority, who put it in his small enclosed office (thereby making it much less safe) and then called the bomb squad.

OP sets up a "science demonstration" on roof of his high school

A "punk kid" discovers said "demonstration"

The "punk kid" tells the gym teacher

The gym teacher takes the "science demonstration" from where it was safely installed to his enclosed office

The gym teacher calls the LAPD bomb squad