A fake bomb for a school project.
Mind you this was 1990, waaay before 9/11. For my security management class, i plain brown paper wrapped several small boxes (shoe boxes cut in half) with a paper that read "BOOM" inside each.
I left them in several places throughout NYC (crowded subway train, St. Pat's Cathedral, Police station, hospital...) in all cases being pretty conspicuous. At the theater i was asked if i had booze under my jacket. I flashed the box and said "nah, its a bomb", to which the usher laughed and let me keep going.
My Instructor demanded proof (again, 1990; i couldnt just use my cellphone to take vids), so i took him and my class to the school boiler room.
I'd borrowed the keys from the janitor earlier that week (saying i was gonna blow up the school haha) and left a fake bomb in there too.
Got an A+ 😄
SQ