What you're describing - no, not cool. On a lesser scale, as long as no one gets hurt (including psychologically) and property isn't destroyed, have a little fun.
Engineering students are notorious for pranks. Fifty years ago that included building brick walls across the middle of a bridge on our campus
By the time I got there it was watered down, cleared with the dean and police in advance, etc. But we still had fun
Heck, even the operators of the observatory that got painted like a pumpkin every halloween didn't mind because the students always used water based paint that pressure washed off quite easily. We had a president of the university that hated the engineers and the pranks. So they threw an effigy of him off a building behind him during his speech to first year students in opening week. I don't think that helped matters..... but it was funny......
