That was rich!
The Army training class I was with in 1969, pulled a similar stunt on our TAC Officer, only with balloons in his office. It took 50 of us all weekend to blow up hundreds (?) of balloons and stick 'em in his unlocked window. His floor was covered to the depth of the top of his desk. He opened his office door Monday morning and dropped his armload of files. His last laugh was to pop every one of them with his swagger stick and a cigarette then having two of us clean them up off his linoleum floor. HINT: a broom didn’t work.
Beats Mr. Moose’s pingpong balls!
I was an organic chemistry major for a while in college. Anyway, one of the residents in my dorm could have been a poster boy for “PIA’s R’ US”. One weekend, I liberated something like 5 gallons of styrene monomer from a lab. We set it in the middle of his dorm room, added about a quart of di-t-butyl peroxide (an activator), stuck two electrodes into the bucket, plugged it into a transformer and quickly shut the door. When he returned on Monday, the entire interior of this room was a solid block of polystyrene (the pressure of the expanding foam actually blew out a pane of glass in the window). Took him two weeks to hack it all out with knives and a hatchet. It was BEAUTIFUL!
Brian